"Christopher and Kat went to Sonic's world?!" Mrs. Thorndyke gasped. "Well, we have to bring them back, right now!"

Francis looked at her. "I don't think we should try to operate Chris's machine, Mrs. Thorndyke." She said sympathetically. Danny nodded. "Only Chris understands how it works!"

Chuck nodded. "We can't risk tampering with it, Lindsey." He said. "If I damaged it in any way, Chris and Kat would be trapped in Sonic's world forever."

"But we can't just leave them there!" She gasped. "I was hopping to visit my daughter..."

Mr. Thorndyke smiled at her. "We have to trust our son. Kat and Penny, too."

Mrs. Thorndyke looked at him. "But..."

Mr. Thorndyke smiled. "Chris and Kat know how to take care of themselves now. They'll take care of Penny as well. And you know it's never wise to underestimate a Thorndyke." Mr. Thorndyke chuckled at that last bit.

Mrs. Thorndyke sighed, and gave her husband a hug, which he returned comfortingly.

Chuck smiled in response.

Helen rolled up to Mr. and Mrs. Thorndyke in her wheelchair, and gave them both a reassuring smile. "I'm sure Chris, Kat, and Penny would try to communicate with us, Mrs. Thorndyke." She said. "We'll stay here at the lab and let you know right away if we hear from them."

Mr. Thorndyke smiled at her. "Thank you, Helen." He said. "Please do."

...

Soon, Penny found herself traveling through Outer Space with her friends in Tails's new space shuttle... the Blue Typhoon. Knuckles had announced that he had finally detected a Chaos Emerald.

"You've finally detected a Chaos Emerald?" Cream asked in excitement.

"Are you sure about this Knuckles?" Penny asked.

Knuckles nodded at the human girl. "Yes. There's no doubt about it. I was in the engine room a few minutes ago, when I saw the Master Emerald reacting to something. It must have been an Emerald."

"Really?" Cloud asked, putting his hand on his hip.

Blaze looked at Tails. "Check for a planet nearby." She said, switching her cat tail.

"Let's see." Tails pressed a few buttons on his control panel. And soon, a hologram of a planet popped up. Chris looked at it for a while until he pointed to a spot on the planet. "There's one." He said.

Cosmo looked at him. "That's Planet Seco."

"Planet Seco?" Blaze and Cloud asked together.

Sonic smiled down at them. "And according to my Galactic Guide Book, it's dry as a bone!" He closed his book and hopped out of his seat, landing next to Penny.

Amy smiled. "Tails! We're going to land on Planet Seco and find that Emerald! Let's go!"

Tails sweat dropped. "I'm supposed to give the orders here..."

Amy rolled her eyes. "Just do it!"

"Guess we have two commanders on board." Tangle joked, and Penny giggled.

...

Soon, they landed on the planet, but to Penny's surprise, it wasn't dry... it was full of water!

"According to the scope, there's a lot of water on this planet!" Chris said.

"That sounds weird..." Whisper whispered, looking concerned. Penny nodded. Sonic looked nervous beside her. "Oh, no, we can't land here! There's gotta be some kind of mistake!"

Penny giggled.

Knuckles and Silver chuckled. "Tough luck, Sonic."

...

Soon, after being forced to land the Typhoon in the water, everyone got into their own diving tanks. Penny and Sonic shared one, and Chris added an extra seat in the sub so he could keep an eye on his sister and friend. Sonic looked at Tails. "You must've made a wrong turn, Tails!" The blue hedgehog said, sweat dropping. "The guide book says this planet's dry!"

"Don't blame me, Sonic." Tails said as he climbed into his diving tank. "Sounds like your Galactic Guide book's seriously out of date."

"There's way too much water here! I hate water." Sonic whimpered. Penny chuckled and patted his shoulder reassuringly. "Don't sweat it, Sonic." She smiled. "Chris has a way for you to stay dry even when you're underwater!"

Chris smiled at them. "You're not afraid of submarines, are you, Sonic?"

Sonic chuckled, sweat dropping nervously.

...

Penny soon found herself diving into the water with Chris and Sonic in fancy green subs. Sonic looked so panicked when Penny looked over to check on him. He even looked a little sea sick.

"CHRIS! LOOK OUT!" Penny screamed, seeing up coming fish. Chris let out a panicked yell, and tried to dodge the fish. However, that caused the sub the three were in to spin in the water.

...

"Are you sure the Chaos Emerald is somewhere nearby?" Amy frowned, looking at Knuckles. The echidna smirked at her. "I couldn't be surer."

Cosmo looked at him. "What makes you so certain we'll find it here, Knuckles?" She asked.

Knuckles smiled at her. "Because I've got a natural knack for finding things."

"Sure you do." Silver said with an eye roll.

Cream and Cosmo just stared at him curiously.

Knuckles smiled, and put on his shovel claws. "I'll show you!" He said.

And he started digging.

"This will take a while..." Whisper noted with a shake of her head, and started walking down the sandy hills, followed by her wisps.

"Hey, Whisper, wait up!" Blaze called, dashing after the wolf.

"Hiro, how about we look too?" Kat asked the wolf.

Hiro smiled at her. "Sure!" He said. "Where should we look?"

"Well..." Kat frowned as they walked off.

Cream smiled at Cosmo and held up a sand bucket and shovels. "Why don't we dig for the Chaos Emerald too?"

Cosmo smiled at Cream as she pulled a shovel out. After a moment of digging, Cosmo looked at Cream. "You don't think Sonic, Penny, and Chris got ran into some kind of trouble, do you?" She asked worriedly.

Cream grinned. "Wouldn't be surprised." She said.

...

When that crazy adventure was over, Penny opened her hood of the sub and carefully made her way to Sonic, who was coughing a little. "Sonic, are you okay?" She looked over at Chris. "You could've given us a little warning here!" She snapped at her brother.

"Sorry." Chris said, looking truly sorry. He looked around. "Where are we?"

Penny noticed a strange building up ahead. "Hey, look!" She said.

...

Penny stayed close to the boys when they finally made it to the island. Penny had to carry a nearly passed out hedgehog from the water. He could be a handful sometimes, and that got her pretty annoyed with him. "Sonic?" Penny asked. Chris looked at him with worry. "You're okay now..."

Penny looked up and gave a frightened yell, clinging to Sonic. Confused, Chris and Sonic looked up to see strange robotic fish surrounding them.

"They're Metarex!" Sonic said.

"Yeah." Chris said. "And whoever sent them here designed them especially for the water!"

"It all makes sense now!" The fourteen year old whimpered.

"Right!" Sonic said. "I bet their boss stole the Planet Egg and turned this place into a water world! I knew there was something fishy going on!" He growled, getting into a fighting stance in front of the Thorndyke siblings. Penny let out a yell as the first fish lunged an attack. Chris grabbed Penny in his arms as Sonic quickly smashed the robots away from them.

"Run while you have the chance!" Sonic yelled at Penny and Chris. Penny nodded, and darted behind a boulder.

However, Chris stayed with Sonic. "What's he doing?!" Penny gasped quietly. She watched as her brother tried to attack the fish with karate. "Hmm. Mr. Tanaka must've taught him that." She said to herself. "I did miss out on a lot of excitement!"

However, the punch Chris took at them barely left a mark, and the boy was soon being chased by him. "Quit kidding around, Chris!" Sonic yelled.

"I'M NOT A KID!" Chris yelled as he ran.

Penny raised her eyes. "But he basically is." She said.

"Get going!" Sonic yelled. "I'll take care of them! Take Penny and run!"

"Don't you want us to help you?!" Chris yelled.

"That's okay." Sonic smirked. "Leave the fighting to the experts, Chris."

Chris ran over to Penny and grabbed her arm, and started running. Penny tried to keep up with him, but he was getting even faster. Penny let out a yelp as she tripped over a rock. Chris saw her danger and got in front of her. Before the monster could reach Penny, Chris gave the robot a punch, but ended up injuring his own hand. The boy started yelping in pain.

"Chris?" Penny asked. She yelped as a monster grabbed her shoulders. Chris too was about to get captured, but Sonic pushed him away, and the boy landed in the water.

"CHRIS!" Penny shrieked. Sonic quickly got into spin mode and smashed the robots. He turned to Chris. "Get help!" He yelled.

Chris made his way to the sub. "But Sonic..."

Sonic glared at him. "Get into that sub and get going!"

"Look behind you!"

Penny turned around, and gave a yelp when more Metarex surrounded herself and Sonic. "Penny, run!" Sonic yelled. The girl tried, but she soon felt metal claws pick her up. "SONIC!" She shrieked, but Sonic was picked up to. The two gave a yell as they were tossed in the water.

"Just don't panic!" Chris cried. His eyes widened with fright as a net flew in the air and trapped Sonic and Penny. Penny yelped as she felt the net yank up.

"Just hold on, guys!" She heard Chris yell through the wind. "I'm coming for you two!"

"GO BEFORE THE METAREX GET YOU AS WELL!" Sonic yelled as he and Penny struggled in the net.

"I WON'T LEAVE YOU TWO!" Chris yelled.

"LITTLE BROTHER, YOU HAVE TO!" Penny yelled, her eyes wide with fright. "SEND SOMEONE TO HELP US!"

"YEAH!" Sonic yelled. "IF THEY CATCH YOU TOO, NONE OF US WILL SURVIVE!" Sonic yelled.

Finally, Chris got into his sub, and drove off.

...

"Sonic and Penny got captured?!" Tails, Silver, and Cloud yelped in shock after Chris told them what happened.

"Yeah." Chris said as he tinkered the X Tornado. "But I'm going back to rescue them."

"Chris, are you crazy?" Cloud asked.

"By yourself?" Tails added. "There's no way, Chris!"

Chris looked down at the trio of Mobians. "Trust me!" He said. "I know what I'm doing, Tails, Cloud, Silver!"

"NO YOU DON'T!" The three yelped.

"I do!" Chris said.

Tails ran up to the boy. "But what's your plan, Chris?"

Chris raised his hands. "I'll fly back to where Sonic and my sister are and I..." He paused, and realized Tails was right. He really wasn't coming up with much of a plan. "I... uh... I don't know."

Silver smiled at him. "We can save Sonic and your sister if we use teamwork!"

Cloud nodded. "There's definitely no reason for you to rescue them all alone."

"Okay?" Tails asked.

Chris sighed as he got out of the Tornado. "Okay."

Hearing Tails's communicator watch beeping, Tails answered it. "This is the Blue Typhoon. Over."

"It's Amy. I'm calling from under the island." Amy answered.

"I'm here, too!" Tangle announced.

"I have some bad news about Sonic and Penny!" Tails told them.

Amy smiled at him through the screen. "They got captured?"

"Why are you smug about Penny being captured as well?" Tangle asked Amy.

"Because!" Amy snapped back at her.

"How'd you find that out?" Tails asked.

"Tangle and I just made a whole bunch of new friends!" Amy said with a smile at the group of people around them.

"Yeah! They saw the Metarex capture Penny and Sonic!" Tangle said.

"We gotta go rescue them, Tangle and Amy!" Cloud told them.

"I'll take care of them, guys." Amy said. "These folks will show me and Tangle where Sonic's being kept. When he sees me coming, his heart will start pounding faster than my hammer! 'Thanks for saving me, Amy! You're much better than Penny!' My pleasure, Sonic! 'Amy, you're the most beautiful girl in the universe!' Oh, Sonic, really?! You like me more than Penny?! 'You're the girl I've been waiting for, Amy, will you marry me?!' OH! SONIC, OF COURSE I WILL!" And at that, Amy started making kissing sounds.

"Don't forget, Penny's captured, too." Tangle said, sounding exasperated.

"Excuse me?" Chris asked.

"Is that you, Sonic?" Amy asked. She was so wrapped up in her daydream that she thought Chris was Sonic!

Chris flailed his arms. "No, it's me, Chris! We have to rescue Sonic and my sister right away, Amy and Tangle!"

"WHAT DO YOU MEAN MEAN WE?!" Amy snapped at them.

"Okay..." Chris said, sweat dropping.

"Tails, Amy and I will need some time to set Sonic and Penny free. Pick us up in the X Tornado in one hour. Got it?" Tangle asked, breaking up the awkward moment.

Tails nodded. "Got it!"

...

Penny had found herself tied up in a corner while Sonic was being forced to be fish food. She watched with fear as the Metarex bond Sonic to a robotic fishing pole, slowly reeling him up and down.

"Sonic!" Penny whimpered.

"It'll be okay, Penny!" Sonic called out to her.

Penny's eyes widened when the girl saw a giant shark leap out of the water. Sonic squirmed around as he did his best to try not to end up as shark food. Penny scooted back as far as she could. She could hear Sonic yelling at the shark. "Hey, pal, if you're hungry, how about we order you a pizza?"

"SONIC!"

"PENNY!"

Two familiar voices were heard in the stairway.

"No way." Penny gasped. "Tangle? Amy?"

Sure enough, it was them. Tangle ran over to Penny and untied her, using her tail to smash into any robots that got in their way. Hearing a delighted cry, Penny and Tangle watched as Amy darted over to Sonic who was still tied up over the water. She leaped forward and tried to hug him, but Sonic dodged her, and she fell into the water with a splash.

"YOU WERE SUPPOSED TO CATCH ME!" Amy yelled angrily.

"Oh, sorry..." Sonic said. Seeing the shark, Sonic completely freaked out. "Amy, look out!"

At the warning, Amy smashed the shark with her hammer, and the shark fell back into the water, unconscious. The furious little ball of pink dashed out of the water and smashed her hammer into the Metarex, and soon grabbed the pole Sonic was still tied to. "Come on, we have a plane to catch!" She told him, and dodged off.

Tangle followed after her, keeping a tight hold of Penny's hand as they ran. They soon came to a stop in the middle of the stairs, finding themselves surrounded by Metarex.

"AMY! TANGLE!" Tails yelled, and a second later, Penny found herself clinging to Tangle as she and Amy busted through the wall and pulled her and Sonic out. A second later, they landed on the X Tornado, and Penny shakily climbed onto one of the seats.

"I'm heading back to the Blue Typhoon!" Tails yelled.

"Roger!" Amy nodded.

"NOW THAT I'M FREE, HOW ABOUT YOU UNTIE ME LIKE YOU DID FOR PENNY?!" Sonic yelled over the wind.

Penny let out a yell as the X Tornado soon started dodging Metarex missiles. Hearing Amy gasp, Penny turned to see that Sonic had been cut from the rope, and was falling towards the water with an irritated look on his face. "Next time you want to rescue me, don't!" He yelled. He yelped as he neared the water.

"Hey, Sonic!" A familiar voice appeared as a new ship flew up.

"That's Chris!" Sonic and Penny smiled in excitement.

"Try these!" Chris shot Sonic some strange pair of shoes. And after that happened, Sonic splashed in the water.

"SONIC!" Penny shrieked, looking wildly for him.

Once the water calmed down, Penny smiled in relief to see Sonic hoovering over the water.

"How's he doing that?!" Tangle gasped in surprise.

"They're hoover shoes, Amy! Now that's an inventive invention!"

"Like Shadow's!" Penny grinned, remembering how the dark hedgehog used hoover shoes to help him with speed and stealth. She looked down at Shadow's bracelet and smiled.

"Guys, look, more Metarex on the way!" Amy yelled warningly.

However, Sonic was ready this time. The blue hedgehog dashed over to the Metarex and knocked down every one of them.

When the battle was over, Penny saw something blink. "The planet egg!" She gasped.

There it was, clear as day and in the water, spinning around like a miniature galaxy. The egg sunk into its rightful place, and soon all the water drained.

...

After that crazy adventure, Sonic smiled to himself as he now stood on dry ground. "Feels fantastic! Back on solid ground!" He laughed and turned to Chris. "These shoes are great!" He smiled. "Hold on to them for me, will ya?" Sonic smiled, tossing them up to Chris, who caught the case.

Chris smiled at Sonic. "If you like the shoes, I've got some other stuff you can try!"

Sonic shot Chris a thumbs up. "Will do!" He said with a smile and thumbs up.

"Come on, I'll race you and Penny back to the Blue Typhoon!" He said.

Sonic sped off.