In the dessert Ben, Star, Kevin and Gwen were riding in Kevin's car. Gwen was taking a nap.

"Are we there yet?" asked Ben and Star

"Does it look like it?" asked Kevin

"I'm just saying we should hurry. Grandpa Max wants us to check out those things." said Ben

"Another half-hour - less if I kick in the ram jets."

"You have ram jets?" asked Star

"No ram jets. Trying to sleep." said Gwen still a sleep. Something on Kevin's car started to beep. "Kevin?"

"Speed trap coming up. Highway Patrolman with a radar gun." said Kevin

"We're on duty. Can you do something?" asked Ben

"Can I do something?" Kevin pressed a button and the car went invisible. They drove pass the Highway Patrolman. Once they got to a safe distance they uncloaked. They got to the place were Grandpa Max told them were the creatures were. They got out of the car.

"Cloaking field gives me a headache." said Gwen

"Speeding tickets give me a headache." Then Kevin looked thru a pair of Kevin then gave them to Ben so he could see the creatures.

"Well, that's unnerving." said Ben

"So? What's the big deal if they eat a few rocks?"

"Haven't you look at your self recently?" asked Star

Kevin reached into his car and pulled out a mask. Kevin put on the mask and he was turned back to they way he was before.

"Pretty cool."

"I.D mask? Well you look human now." said Ben

"Maybe now's not the time for that." said Kevin as he took of the I.D. mask.

"But you still want to stay away from those things." said Gwen

"Yeah, they might have you for lunch." said Ben as he ran down the hill they were on.

"And we don't want that." said Star

Ben got down the hill. "Hero time!" said Ben. He activated the omnitrix and hit it but it didn't work. "Humongousaur!" Ben noticed that it didn't work. He hit it again but it didn't work again. "Humongousaur!" Then the creatures started to charged at Ben. Ben started to hit the omnitrix several times but it didn't work. "Humongousaur! Humongousaur! Humongousaur! Ugh!" Ben got knocked down.

Star, Kevin and Gwen noticed what happened to Ben. Kevin turned his right hand into a hammer and his left hand into a club. Then Kevin and Star ran down the hill. Kevin started to hit some of the creatures and Star maneuvered around the creatures. "Ben, where are you?" asked Star

"Ben!" said Kevin. Then one of the creatures turned around and bite Kevin's left hand. "Ow!" Kevin hit the creature with his right hand. Kevin then noticed he was surrounded by more creatures. "You have got to be kidding me!" Kevin started to run and he was being chased by the creatures. Gwen made energy step and walked over them and got to Kevin and put up a doom up protecting them. Star helped Ben up.

"We will be with you in a minute." said Star

"I'm okay!" said Ben as he got himself together. He hit the omnitrix again and this time it worked. "Brainstorm? Bewildering." Star used her wand and summoned a pink cloud.

"Do you mind lifting Ben into the air?"

"Sure thing Star." said the cloud

Ben got on to the cloud and it lifted him up into the air. Ben lift the flaps on his head and started to shot lightning at the train and the tracks. He lifted them up into the air and surrounded the creature. The creatures were about to destroy Gwen's dome. "Can't hold it anymore." said Gwen. Just as the dome brock a portal opened under there feet and they dropped thru it. They appeared right next to Star soon Ben joined them and Star used her wand to send the cloud away. As well she closed the portal she made.

"Those cow things bit me!" said Kevin

"Precisely why I chose to surround them with the metal rails. I observed that they only eat stone." said Ben

"Lucky me." Kevin said as he looked at his left hand.

Some time later they got to a creature that they came from. As well got contact with Max.

"Those are Pyroxovors. I haven't seen one in years." said Max

"How come we never heard of them?" asked Kevin

"Kid, there's lots of species here on Earth you won't find in any book. That's where fairy tales come from. Unicorns, trolls, pixies - they're all real."

"I rode wild unicorns back on Mewni and my mirror services use to run by pixies. Before I changed it." said Star

"Even Bigfoot?" asked Kevin

"Don't be ridiculous. That's a guy in a suit." said Max

"Do you know what drove them to the surface?" asked Gwen

"I don't know. Something scared them or made it too uncomfortable to stay underground."

"They're walking tanks. What could make them uncomfortable?" asked Kevin

"Let's find out." said Ben. Then they cut communications with Max.

They entered Kevin's car and Kevin started to drive down into it.

"How far does this go?" asked Gwen

"I don't know, but this is as far as we go. End of the road." said Kevin. He stopped the car.

"Now what?" asked Star. The floor started to crack.

"You had to ask." said Kevin. They floor gave way and the started to fall. They started to scream.

"I'll turn into Jetray and slow us down!" said Ben. He was going to use the omnitrix but Kevin stopped him.

"You'll dent the roof!" Kevin pressed a button and then a parachute came out of the back. It got caught on a rock and it ripped.

"You have a plane "B"?" asked Star

"Yes, I got one." Kevin then pressed a different button. The back wheels moved and shot out jets. The car started to level out and it landed safety.

"That was cool." said Ben

"Yeah, but that can't be good for the suspension."

They exited the car. "The car won't fit. We'll have to go on foot."

"There must be another way." said Gwen with a little hint of fear.

Kevin chucked. "What, are you claustrophobic?" asked Kevin

"I am so not claustrophobic. I-I just can't stand being in tight, close spaces, okay?!" said Gwen

"Yeah it sounds like you are claustrophobic." said Star

"Well I'm not."

"Okay, what ever you say."

"I'll go first." said Ben. Ben went thru. He was followed by Star then Kevin and finally Gwen. They got to a open area.

"Wow it's dark."

"No problem." said Kevin. He lite a match and started to read writing on a box. ""TNT."" Then Gwen ran up and blow out the match. "What did you do that for?" Kevin lite another match. Then Ben and Star ran over then Ben, Star and Gwen blow it out again. "Cut it out!"

"You cut it out! The room's filled with dynamite! You almost blew us up!" said Ben

"How was I supposed to know?"

"I don't know. Reading?"

Then they noticed there was some light coming from Star and Gwen. "We'll handle the lighting." said Star. Then the place was full of light. Then some rocks started to fall.

"Move!" Kevin hit a few of the rock. "Find some cover."

"I'll make some cover." said Gwen as she made an energy doom covering them. Once a rock fell they noticed that something pushed it off.

"There he goes!" said Star

"No, he doesn't!" said Ben. He activated the omnitrix and hit it. "Big Chill!" Ben started to fly and fazed thru th ground right in front of him. He turned around but Ben grabbed him. He started to fly back into the air and took him the rest. "Cool down, or I'll do it for you."

As soon as you let me go, I'm a-blowin' you up!" said the creature

"Sure, you will."

"It's pos- aah."

Ben turned back to normal. "Don't be afraid. It's still me."

"Not really helpin', sonny! You're still ugly as all get-out!"

"What's your name, old-timer?" asked Kevin

"Moldywarp! said Moldywarp

"That's what your friends call you?" asked Ben

"Friends?! I don't have no friends!"

"Your the last of your of your kind." said Gwen

"No such luck! The Underworld is crawling with folks like me. I just don't like 'em much! And they don't like me!"

"You don't say." said Kevin

"What are you doing with all the explosives?" asked Star

"Oh, I've been stealin' that stuff from the surface-dwellers for years!" said Moldywarp. He pressed a button and the lights came on and the whole place was light up.

"Some of this looks pretty old." said Gwen

"It is! TNT, blastin' caps, nitroglycerine! Primitive, but they sure get the job done!"

"What job is that?" asked Ben

"Protectin'g my herd!"

"Your heard?"

"Yeah! The Pyroxovors! Real beauties, ain't they?"

"They tried to eat my hand." said Kevin

"You shouldn't let 'em do that."

"Uh-huh. He doesn't know anything. we should ditch." Kevin whispered to Ben

"I heard you!"

"Why were you throwing rocks at us, Moldywarp?" asked Gwen

"I couldn't get to my explosives. That's what I mostly use on the other fella!"

"What other fella?" asked Star

"The claim jumper! Don't you know nothin'?"

"Not so far." said Gwen. They got into an elevator and started to head down. "No wonder the Pyroxovors came to the surface. It's like a furnace down here."

"Is it always this hot?" asked Ben

"No! That's what I've been tryin' to fix. It's only hot since all that magma started seepin' up." said Moldywarp

"Magma?" questioned Star

They entered a cavern and saw that there was machines and stuff.

"Whoa." said Ben

"Who dares intrude on the lair of the - oh, not you again!" said Volcanus

"Ah! So you do know him." said Moldywarp

"Valcanus?" Yeah, we know him. We don't like him, though." said Kevin

"The feeling is mutual. Destroy them!" said Volcanus

They soon got surrounded by Volcanus's minions.

"Come on. We hammered these losers last time. Is that all you got?!" said Star

Volcanus pressed a button and two vehicles came out one has a drill on it and the other has a scope.

"You had to ask." said Gwen

"Why are you here?" asked Ben

"Remember all that Taedenite that I took off of you?" asked Volcanus

"Yeah. I remember." said Kevin

"Well, it was worth a fortune. And you'll be glad to know I spent it wisely." Then something appeared in front of the group. "See, this is my planet now. I filed a claim, paid the fees, the whole bit. Completely legal."

"What does that mean - "Planetary renovation permit"?" asked Ben

"Exactly what it says! I get to change the atmosphere, the terrain, the oceans any way I want." said Volcanus

"That's what the bomb's for!" said Gwen

"Yep! I drop it down the shaft, it explodes in the magma at the center of the Earth, and before you know it, I have all the comforts of home."

"Wait. Home? Where you come from, on a cool day, it's 850 degrees." said Kevin

"UH-huh."

Moldywarp chuckled. "You thought I was crazy!" said Moldywarp

"You can't do that!" said Ben

"Yeah!" said Star

"Of course I can! Watch." said Volcanus. He pressed something and a timer started to count down.

"You guys handle the runts and robots. I'll stop Volcanus." said Ben

The vehicle with the drill started to attack. They dodged the drill. Both Star and Gwen started to blast the runts and robots.

"Yee-haw! I was hopin' we'd get to some fightin'!" said Moldywarp

Ben continued to run and was dodging the vehicles as they attack Ben. Kevin stared to hit the runts and robots. Star took a shot at Volcanus. Volcanus dodged the blast. "Somebody do something about her!" said Volcanus

Soon a lot of the runts and robots started to target Star. Moldywarp even thru some time bombs at them. "That's a little harsh." said Star

"I blows 'em up all the time. I think they like it" said Moldywarp

The vehicle with the drill headed towards Star. It was about to attack when Gwen got there and put up shield. Kevin saw what was happen and started to head over, but he was tackled to the ground. Gwen's shield was destroyed and Gwen quickly made a new one. Star blasted more runts and robots to keep them of Gwen. Ben noticed the trouble that Star and Gwen were in. He kept dodging the other vehicle. "It's hero time, tin man!" said Ben. He hit the omnitrix and nothing happened. "Maybe my watch is fast." Ben started to dodge again.

"Ben what are you waiting for?" asked Gwen

"Maybe it's the heat!" said Ben

"Maybe you're doing it wrong!"

Then two explosions happened, destroying the two vehicles. "Now get that varmint!" said Moldywarp

Ben hit it and this time it worked. "Spidermonkey!" said Ben. Ben climbed up and hit some runts as he made his way to Volcanus. Ben kicked Volcanus a send him flying back. "Stop the countdown."

"Make me!" said Volcanus. He started up a small drill on his left hand. He lunged at him. Ben jumped up and got on his back. "Stay put, will you?!" Volanus tried to get Ben off his back. Ben kicked Volcanus to the ground as he jumped off. Volcanus turned around. Then Ben jumped up and punched Volcanus in the face several times. Volcanus charged at Ben. Ben dodged out of the way and Volcanus got his left arm stuck in the control console. Ben then shot webs on Volcanus. "I'm stuck!"

"I know. I stuck you." Ben then punched Volcanus twice. "Now... stop the countdown." Volcanus pressed a button on the console and the countdown started to decrees to 30 seconds. "I said stop it, not speed it up."

"My mistake."

"When that bomb goes off, the magma will come right up into this chamber. It'll kill you, too! Are you crazy?!"

"That would be crazy." Volcanus press a button on the console and a hatch on the roof of the cavern opened. He then pressed something on suit and he was ejected thru the hatch. Then an alarm beeping. The runts and robots started to run away.

"That doesn't look good." said Kevin

They then noticed that Ben was near the hole. "Ben, what are you doing?" asked Star

"I can grab the bomb when it drops." said Ben

"But, Spidermonkey isn't strong enough to catch something that heavy!"

"No, but I know someone who is." Ben taped the omnitrix symbol. "Humongousaur!" Then Ben noticed that he was Jetray. "Ugh! I really have to get that fixed." The bomb started to drop.

"Ben if that bomb reaches the Earth's core..." said Kevin

"We're toast." said Gwen

"I'm on it!" said Ben. Ben started to fly down the hole after the bomb. Once he got close enough he started to fired lasers from his eyes at the bomb. He soon fired a laser from his tail as well. The bomb then exploded and Ben started to head out of the hole.

Out of the hole with Star, Kevin, Gwen. Gwen had a energy shield to protect them from falling debris. Soon Ben flew out of the hole. Ben got to the group and turned back to normal.

"Well?" asked Ben

"We're still here, aren't we?" said Kevin

"So, then... everything's okay?" asked Star

"Abso- wait. Where's Moldywarp?" asked Ben

They returned back to were they first meet Moldywarp. They saw Modywarp set some timers on the crates of explosives.

"Um, what's with the timers?" asked Gwen

"I figure what's to keep Volcanus from comin' back and dropping another bomb down the shaft, huh? After all, he did fill out the paperwork."

Star opened a portal with her dimensional scissors. They got into Kevin's car and he drove thru the portal and the appeared were the heard is at. Star got out of the car and closed the portal right as the timers went off and they started to exploded. Soon the rest got out of the car.

"I love it. Volcanus spent a fortune on filing fees and got nothing and got nothing in return." said Kevin

"And we saved the Earth from being turned into a giant hot plate." said Gwen

"Now all we have to do is get the Pyroxovors back underground." said Ben

"That shouldn't be to hard." said Star

"I'll handle that! First, what say we celebrate with a nice supper?" asked Moldywarp

"Supper?"

"Yes, sirree, bob! This looks like a plump one!"

"You eat them?" asked Gwen

"'Course I eats 'em! They're my herd! No, who wants barbecue?!"

"Ew!" said Ben, Star and Gwen

"Now that you mention it, I haven't had anything all day." said Kevin. Then Gwen elbowed Kevin in the side. "Ow! What?"