Soon, Sonic, Penny, and the others finally made it on the volcano. Penny was getting pretty nervous about this... she hated volcanoes. They plagued her nightmares ever since she first read about them.

"You okay?" Sonic asked with worry.

"Yeah, Sonic." Penny said, hugging herself. "I guess I'm kind of scared of volcanoes..." The girl looked around the island. Being here didn't really help at all.

Sonic patted her back and smiled at her reassuringly. "Don't worry." Sonic said with a smile. "You'll be with me on this one! We'll be out before an eruption happens, don't worry."

Penny smiled back at him. Having him there made her feel even safer. Hearing arguing, Penny and Sonic turned around to see Topaz arguing with the government agents.

"If you'd put up a fight against Eggman instead of letting him capture you, we wouldn't be stuck here!"

"Yeah, we had Eggman trapped, but he had you and your crew on board so we couldn't destroy his ship!"

Topaz sounded furious. "Don't act that was what stopped you!" She yelled, and she ran off.

"She's upset." Mr. Tanaka said, watching Topaz run off with worry.

Chuck smiled at him. "Why don't you go and comfort her?" He asked.

Mr. Tanaka bowed. "If you insist!" He said. "I will do what I can!"

...

"But I know I could fly the X Tornado down into the crater!" Tails said.

"But it's too dangerous!" Chris said.

In the last episode, Eggman had flown into the top of the volcano and disappeared. Now, they were trying to find a way to capture him.

"It's the only way to catch up with Eggman." Sonic smirked. "I'm in!"

"Rouge?" Knuckles asked. "What about you? You willing to come along?"

Rouge smirked at him. "Doesn't sound like I have a choice!" She said. "If I stay behind, there won't be anybody on the team to look after you."

Penny chuckled as Knuckles fumed even more scarlet then he normally was. "Hah!" He grumbled. "Very funny!"

...

"We found something!" Mr. Tanaka announced as he and Topaz walked up with a curious looking box. "Here, doctor!" Mr. Tanaka said, putting the box in Dr. Cadbury's hands. The doctor's mouth dropped open in surprise. "Incredible!" He said. "This box seems to be made of americium!"

"What's americium?" Chuck asked curiously.

"It's an unusual metal that was used by the Murasians!" He opened up the box, and inside it was a white diamond.

"Hello!" Rouge gasped happily, her sea blue eyes sparkling at the treasure. She watched with gleaming eyes as Dr. Cadbury looked at it. "According to my research, Murasian cities were filled with precious gem stones even larger than this one!" He held the diamond in his hand. "Amazing!"

"I never knew archeology could be so fascinating!" Rouge said.

...

While all of this was happening, Eggman and his robots had been flying downward in the volcano for quite some time.

"Doctor, we will hit the lava soon!" Bocoe said, his eyes wide.

Eggman chuckled. "I have a plan, don't worry!"

Decoe looked around. "If it is anything like his past plans, we are going to get burned!"

Bokkun popped in between his fellow robots. "Are you two doubting Dr. Eggman?!" He asked.

"You know what I like about him?" Decoe groaned.

"Yes." Bocoe said. "Nothing!"

Bokkun looked furious. "Well, I don't like you two either!" He yelled.

"I located a tunnel that will take us further underground!" Eggman said, pressing a few buttons. In an instant, his mobile soon turned into a transportable machine, and with special wheels, it rolled into a tunnel.

...

Soon, Penny sat behind Blaze in the X Tornado, her face lined with worry. She still hadn't told Sonic or the others her true feelings about this mission.

"Let's go check out that volcano!" Tails said, pressing a few buttons. When they went near the volcano, Penny squeezed her eyes shut. She didn't like this. Not one bit.

When they finally reached the ground, Penny made sure to stick close to Sonic. No way was she going to get lost in this beast!

Rouge looked at a now blocked up tunnel which was supposedly made by Eggman. Rouge turned to the group. "They blocked off the tunnel after they drove through." She said, pointing to some bumps in the ground. "You see?"

"That won't stop me!" Sonic smirked, and left Penny's side at an instant, and started spin-dashing into the now sealed tunnel. Penny yelped as the whole cave started shaking due to the spinning.

"If you don't stop that ticking you're gonna burry us here!" Knuckles yelled, trying to get Sonic's attention. Thankfully, Sonic stopped, and turned to face them apologetically. "Heh. Sorry!"

Rouge walked up to another tunnel she had spotted. "There's another tunnel, but it's pretty narrow."

"Let's see where it goes!" Sonic said, and soon, he, Silver, Knuckles, and Rouge walked into the tunnel. Blaze stayed behind with Tails, Chris, and Penny. She'd noticed that Penny had gotten a bit jumpy when they entered the volcano.

"What about us?!" Chris called out to Sonic and the others as they left into the tunnel. Tails turned to them. "We can search around in the X Tornado!"

...

To Penny's surprise, they finally found Murasia.

"Murasia!" Chris, Blaze, Tails, and Penny said in surprise. Tails pulled out his camera on the X Tornado and started recording for Dr. Cadbury to experience.

...

"The Murasians built an underground kingdom!" Dr. Cadbury said in surprise as he watched the thing from the computer. Chuck looked at him curiously. "But how?"

"As their continent sank, they must've fled to this huge cave and used the power of Burma Assam to make an artificial sun to provide heat and light. Once the Murasians moved underground, some legends say they encountered terrible creatures who destroyed their kingdom and drove all the survivors away. I always thought the stories about underground kingdoms and monsters were myths, but it seems there is some truth to them after all." Dr. Cadbury said.

...

"I don't believe those monster stories." Rouge said as she sat on the wing next to Knuckles.

Knuckles smirked. "I'd love to meet monsters down there!" He said. "I could challenge them to a fight!" He smirked as he raised his fist. "I destroy them all!"

"That's our Knuckles." Penny chuckled from inside the plane.

"You know, you're kind of cute when you talk about how tough you are." Rouge said in agreement.

"You know I can't stand you?!" Knuckles growled.

Rouge smirked, looking away. "I'm not surprised. There's a very thin line between hate and love."

Knuckles grumbled. "Well, you make it thicker!"

"Would you two take it easy, please?!" Tails pleaded. "We've got enough turbulence up here!"

...

"Those two are like oil and vinegar." Chuck said, rubbing his head after listening to Rouge and Knuckles' conversation on the communicator.

Topaz and Tanaka looked at each other, and chuckled.

...

While all of this was happening, Eggman and his goons had set up camp on Murasia. Eggman was concentrating on his work when Bokkun popped up at his side, and started banging a plate with a fork. "Hey, I need some yummy in my tummy!" He announced.

Eggman looked at Bokkun. "Now that you've mentioned it, I'm hungry, too. Decoe, Bocoe." He called his two bots over. "Go grab us some grub on the double!"

The two robots poked their heads in the tents, looking anxious. "But what if we get lost?!" Decoe asked.

Eggman laughed. "Hah! I'm not that lucky!"

"Why don't you send Bokkun?" Bocoe asked, pointing over at the black robot.

"There might be wild animals around here and I don't want to be a snack for a snake!" The little robot said.

"Bokkun's right!" Eggman said. "You two aren't indigestible!" He leaned back into his seat, chuckling at his little joke, waving his robots away.

Decoe and Bocoe growled in annoyance, but set off to find some food.

...

When they finally arrived at the entrance of a palace, Tails put a strange machine on the ground. "Cross your fingers!" He said, pressing a button.

...

"The seismograph seems to be working fine." Chuck smiled at the machine as it unleashed a long strip of paper with black dots on it. Dr. Cadbury pointed at the paper. "These readings will give us an idea of how much internal pressure is building up inside the volcano." He explained.

...

"This is hopeless!" Decoe complained as he scanned the area for some food.

"Look!" Bocoe said, pulling a slug from the ground. "I found something!"

"It's an animal!" Decoe jumped.

Bocoe grinned. "It probably tastes like chicken!" He said.

Decoe pointed at it. "I do not want to find out!"

Something red caught the yellow robot's eyes, and he pointed to a giant red cherry in the tree. "There! That looks more appetizing!" He announced.

Both robots walked up to it. "I have never seen such a huge cherry!" Bocoe said.

"Our search has been very fruitful!" Decoe said in agreement. Both robots climbed on each other to try to reach it, but stopped short when a monstrous beast rose from the bushes. It was a moment too late when they realized they were tricked.

Both robots ran away, screaming, with the giant bug monster flying behind them.

...

Hearing panicked yelling, Penny looked up to see Decoe and Bocoe being chased by a monster. She and her friends screamed at the beast.

After calming herself down a bit, Penny looked at the robots with worry. "Maybe we should do something to help them?" She suggested.

"This monster is bugging me out!" Decoe screamed.

"I would do anything for a giant mothball!" Bocoe whimpered.

"I'll distract it!" Penny announced, much to everyone's surprise. The girl picked up a rock and tossed it at the beast. Penny gave a yelp as it stared at her, and soon she found herself running in panic after Decoe and Bocoe.

Penny gave a yelp as both robots pushed her to the ground, which soon turned into a hole. She, Decoe, and Bocoe yelled in panic as they fell through the hole.

...

"Hey, Penny!" Sonic yelled. He was scanning the whole area for the girl with Rouge, Knuckles, Silver, Blaze, Tails, and Chris. "Where could she be?!" Sonic thought, feeling panicked for his human friend. He now knew of her fear of volcanoes. He had to find her before trouble starts... and before a real eruption happened.

...

Penny continued falling down the hole along with Decoe and Bocoe. The two grunted as they landed behind Dr. Eggman. Eggman turned around, and his face darkened when he saw Penny. "What did you bring that brat back here for?!" He yelled accusingly.

Penny shuddered.

"She risked her life to save us from a giant bug!" Decoe said.

"Really?" Eggman smirked. "Well she isn't going to save you from me when I tear out your power supply!"

At that, the whole ground started shaking, and Penny yelped, sweating a little in fear. That wasn't a real earth quake, was it?! She panicked in her head. Both Decoe and Bocoe started running around her, screaming in panic.

...

"Are Sonic and the others okay?!" Amy asked Dr. Cadbury and Chuck with worry after the earth quake. Dr. Cadbury looked serious.

"That was just a tremor so they should all be fine. The pressure inside the volcano is building. Your friends are going to be in a real danger if they stay down there much longer!"

"How bad are things going to get, doctor?" Chuck asked.

"The data suggests that the volcano is about to erupt!"

Everyone gasped.

...

"What do we do?" Knuckles asked Sonic.

"We don't have any time to lose!" Sonic said, his face full of determination. "I've gotta find Penny fast!" At that, the blue hedgehog darted as fast as he could into the forest.

"WE SHOULD COME UP WITH A PLAN FIRST!" Knuckles yelled after him.

Rouge smirked. "The best thing for me to do is to wing it." She said as she flew off.

"WHERE DO YOU THINK YOU'RE GOING?!" Knuckles yelled.

"I'll search for Penny in the sky." She said. "You, Silver, Blaze, and Tails could set up the equipment and look for that hot spot. Make sure you find it before Eggman blows it up!"

"Makes sense to me." Silver said with a nod.

"Knuckles? What do you think?" Blaze asked.

"Alight." Knuckles finally said. He looked up at Rouge. "But be careful, Rouge! And good luck."

"I'll see you soon, handsome." Rouge smirked with a wink as she flew off.

...

Soon, Penny found herself tied up in ropes, sitting on her knees beside Decoe and Bocoe. Eggman walked up to her. "For such a small fry, you certainty are a big sap! You risked your life to save these clowns and now you're my prisoner!" He snapped, and the human girl winced as she wished she could make herself smaller and hide away from this madman. "How hilariously humiliating!" Eggman laughed.

Penny huffed. "I'm glad I tried to rescue them!" She said. "I believe they're not bad bots!"

Everyone yelped as the volcano rumbled again.

Eggman checked his computer. "My analyses is finally finished, and it shoes the hot spot is only a few hundred yards away!" He walked up to his robots and kicked them. "Quit loathing and let's get moving!"

...

Rouge had been scanning the air for Penny when something from a far away ruin caught her eye. Forgetting about the mission, she walked around until she found a huge pile of treasure.

"Oh, my!" She gasped, her eyes twinkling.

...

Meanwhile, Penny had found herself sitting in the back of Eggman's mobile, still bond with ropes. When they reached the ground, she was pushed lightly out of the ship and led by Decoe. Eggman smirked. "Watch closely, kid." He told her. "You'll see why I'm called a master mayhem! By setting off a blast in this spot, I'll cause a chain reaction!" He turned to her with a smirk. "This whole planet's going to blow its top! Every volcano in the world will erupt, leading to world wide Chaos! On top of the ashes of the old world, I can build my own empire!"

Penny glared at Eggman, squirming a little in her ropes. "Sonic will stop you in time!" She growled, surprising herself with her rare bravery.

Eggman glared at her. "Sonic better hurry then cuz I'm gonna hit the detonator switch right now!"

Penny began to panic. "You can't set that off!" She yelled as she watched Decoe and Bocoe pass the control to Eggman. "Just watch me!" Eggman growled, shoving Penny. The girl lost her balance and landed head first into the rocks, and soon stars filled her vision, and she suddenly felt faint.

"Sorry about that, Penny," Decoe whimpered.

"Dr. Eggman, that was mean!" Bocoe said.

"That clutzy girl gave herself the slip!" Eggman said.

...

"This dinosaur rocks!" Bokkun said as he sat on the head of a dinosaur inside the volcano. He was interrupted by another rumble. Bokkun whimpered. "Not another quake!"

Something growled, and Bokkun screamed as his dinosaur sculpture crumbled to the ground.

What was left was a monster.

...

Penny groaned as she sat on the ground, now free from the ropes. Decoe and Bocoe had been kind enough to release her. She was trying to calm her nerves when a familiar frightened robotic voice filled her ears. She looked up to see Bokkun running towards them with a panicked look on his face.

Feeling the ground shake once again, Penny looked up to see a monster. She, Decoe, Bocoe, Eggman, and Bokkun screamed in huge panic.

"SONIC!" Penny screamed in fear. She braced herself for a hit, when she suddenly felt someone scoop her up. Rouge had rescued her just in time.

"Need a lift?" She smirked.

Penny smiled back. This was the second time Rouge had saved her. "Thanks, Rouge!" Penny grinned. When they reached the ground, they heard whimpering behind them. Penny and Rouge turned around to see that Eggman had left Decoe and Bocoe behind.

"He's gone!" Decoe cried, falling to his knees. Bocoe did the same. "We are stranded!"

Penny let out a whimper as the biggest explosion she heard shook the ground.

"The heat's on now." Rouge said.

"What do you mean, Rouge?" Penny asked nervously, hoping this wasn't real. Rouge looked at her with a serious expression. "This whole cave is gonna fill up with lava!"

Penny gulped. It was true. Her worst nightmare was happening right now.

"Let's get out of here!" Rouge said, grabbing Penny's hand.

"It's no use!" Bocoe said. "A bomb is about to cause all the volcanos on the planet to erupt!"

Penny's eyes widened. She couldn't let that happen! The girl felt a surge of bravery through her, and she ran, ignoring Decoe and Bocoe's yells of protests.

Hearing something as she ran, Penny looked up to see the monster's foot ready to smash her. She braced herself, but Rouge smashed it, but to her shock she didn't even leave a mark!

Penny finally made it to the bomb, her hands drenched in nervous sweat. She looked at the time. She had five minutes. Suddenly an idea hit her head, and she ran to the beast. "Hey, ugly beast! I have a present for you!" She yelled.

"Wait, Penny! We will help you!" Both robots said, stepping in her way.

"What type of abilities do you guys have to help?" Penny asked curiously.

"Outside we may look like servants," Bocoe said.

"But inside we are built for battle!" Decoe said. The two shared a spark. "All we have to do is put our heads together."

"And the result is electrifying!" Bocoe said.

"What?! What do you guys even mean?!" Penny asked in surprise.

They began to explain that if they transform in a certain way, they would change from little robots to a huge battle monster. Curious, Penny allowed them to try it out, but in the end, their story was nothing but a tall tale. Nothing happened!

"We must've been in dream mode..." Both robots said in embarrassment.

Penny turned around, and her eyes widened with fear. "GUYS, WATCH OUT!" She yelled in panic. To her horror, a robotic arm swept Decoe and Bocoe away.

"Decoe... Bocoe..." Penny whimpered with worry. Hearing a sudden missile, Penny's eyes widened with happiness and relief to see the X Tornado flying a head.

"There's Penny!" Chris and Tails both said in the plane, relief in their voice.

"HI, GUYS!" Penny yelled happily. "Man, am I glad to see you!"

She watched as Sonic, Silver, Blaze, and Knuckles attack the beast. Penny yelped in fright as Sonic smashed right next to her. "It's pretty tough!" He told her. Sonic quickly grabbed the girl in his arms and darted away just in time as the monster sprayed heavy fire at them.

"There must be a way to stop it!" Knuckles growled as Penny and Sonic landed next to it.

"You're right," Sonic said. "but I don't know what it is!"

"Hey, Sonic, try this!" Penny said, handing him the bomb. It showed 29 seconds left. Sonic smirked at the others. "We could send it off with a bang!" He said.

Penny watched with a smile as Sonic dropped the bomb in the robot's mouth, and soon the robot monster exploded.

"All right!" She cheered.

Her celebration was interrupted by the volcano erupting right then and there. The girl let out a panicked yell as the smell of smoke filled her nose and ringing of the eruption filled her ears.

"COME ON!" Tails yelled. "WE GOTTA GO!"

...

When they safely made it back to the yacht, Dr. Cadbury looked at the volcano. "Murasian culture seems more mysterious than ever!" He said. "I only wish we had more time. Their achievements were astounding, but perhaps they went too far. Their quest for greatness lead to their destruction. We may never know for sure."

Rouge smirked as she showed Knuckles, and Topaz her discovery... a red jewel. "Today, I almost got crushed by a cave, mangled by a monster, and cooked by a volcano. But finding this baby made it all worthwhile!"

She let out a yelp as Dr. Cadbury took it from her. "Another underground artifact from the kingdom of Murasia!" He smiled excitedly. He looked at Rouge and shook her hand. "Thank you, Rouge. Feel free to drop by the museum any time and see it!"

"Yeah, sure, doc." She said.

...

Penny and Sonic stared at the now demolished volcanic island together.

"Decoe and Bocoe sacrificed themselves to help me..." She muttered.

"Yeah." Sonic said. "Guess they weren't so bad after all."

"They proved themselves to be heroes." Mr. Tanaka.

Amy looked down. "I'm gonna miss having those two as enemies."

"You have warned our cold metallic hearts!" A familiar robotic voice said.

Everyone turned around in shock, and there stood Decoe and Bocoe!

"Luckily, we pulled ourselves together just in time to escape the volcano!" Decoe said.

Penny was so happy, that the girl ran up to them and grabbed them in her arms. "You really are incredible!" She said, laughing. "I'm glad you guys are okay!"

Chuck smiled at them. "Two resourceful robots like these could come in very handy someday!" He said, smiling at the robots. "If you'd like to join our team!"

"Oh, you bet we would!" Decoe and Bocoe said once Penny released them. They glared at the thought of Dr. Eggman. "Dr. Eggman always works us overtime!" Decoe said.

"We would like to work him over!" Bocoe added.

"We slaved away for Eggman long enough!" Decoe continued.

"Now we'll take charge of our own future!" Bocoe vowed. Both robots looked over at the volcano.

"EGGMAN, WE QUIT!" They yelled.