As we last left Zack & Cody, they had accidentally swapped bodies with Pinky and the Brain and were now standing face to face with Cody's lab rat, Buck, who could now talk to them in their mousey forms.

"Buck!" Cody/Brain said.

"Hold it!" Buck said, "Who are you? I haven't seen you around here before!"

"Buck, it's me, Cody!" Cody/Brain said.

"Yeah, and I'm Zack" Zack/Pinky said.

"That experiment I was planning to do," Cody/Brain said, "Something went awry and our minds got transferred into these bodies of talking animated lab mice."

"How can I be sure?" Buck asked, "if you are Cody, he was gonna swap bodies with me! Why?"

"Buck, I wanted to only use you as the guinea pig, or rather, rat," Cody/Brain said, "I was gonna change us right back, honest!"

"Oh yeah?" Buck asked, "Then how come you stole me back? You gave me to Kirby! I was happy there! You and Bailey were always fighting over me! It was getting ridiculous!"

"I'm sorry, Buck!" Cody/Brain cried, "I didn't mean for you to feel unwanted! I only wanted what was best for you!"

"Apology accepted," Buck said, as he hugged them.

Suddenly, a hand came in, swept them all up and put them in a cage.

It was Mr. Moseby!

"Filthy vermin!" Moseby snapped, "If I had my way, you'd all be shark bait! But, I have to return you two fellas to Professor Ruegger and you'll be off back to Burbank! As for you, Buck, Kirby wants to keep an eye on you! Plus, I'm told you're really Cody, and we need to get you back to your rightful body. Although, it has been kind of quiet around here, without hooligans running around, no offense!"

"Mr. Moseby, we're the hooligans, Zack and Cody!" Zack/Pinky said.

All Moseby heard were faint squeaks.

"He can't hear us!" Zack/Pinky said in alarm, "then how did Woody?"

"I'm guessing either it was some freak anomaly," Cody/Brain said, "or the time when Woody thought he was part rat left him with the ability to somehow communicate with rats."

"Either way, we've got to stop Mr. Moseby!" Zack/Pinky said.

"Bite his hand!" Cody/Brain commanded, as Zack/Pinky bit down on Moseby's hand. Moseby yelped in pain as he released his grip.

"Run boys," Buck said, "save yourselves!"

Buck scurried up Moseby's jacket, as Moseby screamed and laughed.

Zack and Cody as Pinky and the Brain scurried off.

Meanwhile, on deck…

"This is the captain's quarters, Pinky," Brain/Cody said, "we must commandeer control of this vessel!"

"Gee, Brain, how are we gonna do that?" Pinky/Zack asked, "and wouldn't the captain be mad if we stole his quarters?"

"No, Pinky, this is the room aboard the ship where the captain navigates!" Brain/Cody said.

The captain walked in.

"Can I help you two boys?" he asked, "Say, you're the Martin twins, aren't you? Mr. Moseby warned me about you two! He specifically said to keep Zack away from any radar equipment!"

"Neato!" Pinky/Zack said, as he picked up an instrument.

Suddenly, London walked in.

"Hey Zack, Cody, Cap'n!" London said, "my daddy just called and said you have to reverse the ship's navigation back to Boston!"

"Are we gonna catch a Boston Red Sox game?" Pinky/Zack asked, "Narf!"

"I hope so!" London said, "I bought season tickets! I don't care about the game, but the players are so dreamy!"

"Zack," Brain/Cody said, "why don't you and London have a little chat and go for a little stroll? I must have a word with the captain."

"Well, which is it?" London asked, "Make up your mind!"

"Very well," Brain/Cody said, as he simplified, "go for a stroll, then have a chat. Away with you!"

"Right-o, Brain, I mean, Cody!" Pinky/Zack said, "Narf!"

"The pressures of dealing with the dimwitted," Brain/Cody sighed.

"I hear that," the captain said, "Now what it is you wanted to discuss with me, son?"

"Simply that I'd like for you to grant me the right to command this fine nautical vehicle," Brain/Cody said.

"I'm afraid I can't do that," the captain said.

"Very well," Brain/Cody said, "you leave me no choice. I must now be forced into more extreme measures."

He sprays something on the captain that knocks him out cold.

He gets on the captain's radio linked to the ship's intercom.

"This is the captain's quarters paging Zack Martin," he said, "come in Zack Martin!"

"Sorry London," Zack said, "I have to go! Lovely chat!"

"Bye Zack! Have fun taking over the world!" London called.

"Pinky," Brain/Cody said, "we now have complete control over this ship! I am in command!"

"Aye-Aye Cap'n Brain!" Pinky/Zack said.

"Chart a course for Helsinki, Pinky!" Brain/Cody said, "if I can't become a world leader, I will hold them all for ransom until their governments pay me 1 billion dollars per country for the safe return of each respective leader!"

Meanwhile, on the Sky Deck…

"If you see them, report to me immediately!" Mr. Moseby commanded to Bailey, Woody, and Marcus.

"Who are you talking about?" Bailey asked. "Zack and Cody?"

"No, two mice!" Moseby said.

"Mice?!" Woody screamed, "Talking mutant demon mice!"

"Woody's a bit traumatized from his Rat-Man episode," Marcus said, "I'll calm him down."

London walked up to them.

"London," Moseby said, "What's going on? The ship has changed course, two rats are running loose, and I can't find Zack and Cody anywhere! And why am I talking to you?"

"Zack and Cody are in the captain's room" London said.

"So that explains it," Moseby said sternly, "when I get my hands on those hooligans…"

"I told them to change course," London said, "Daddy wanted us back in Boston."

"Boston?" Marion asked, "Why?"

"I don't know." London said.

"Mr. Moseby, have you seen Buck?" Bailey asked, "according to Woody, he's really Cody. I just have to figure that out for myself."

"As a matter of fact, your little bundle of joy was crawling all over me!" Moseby said, "Has he had his rabies shots?"

"Who, Cody or Buck?" London asked.

Bailey grabbed Buck and he started crawling on her and sniffing her.

"Cody?" she asked, "Is that you?"

Buck jumped down from her grasp and ran across the floor.

"Cody, come back!" Bailey shouted, as they ran after him.

Meanwhile, Pinky and the Brain as Zack and Cody were fiddling around with the ship's controls, when Mr. Moseby walked in.

"What on earth is going on in here?" Moseby exclaimed.

"Human simpleton!" Brain/Cody said, "we have now hijacked this seafaring vessel and we are on the way to Helsinki to lie low!"

"You're not Zack and Cody!" Bailey said.

"Quite, correct," Brain/Cody said, "a keen observer you are, young lady."

"Let's get them!" Cody/Brain said, as they leapt from the vent in the ceiling.

Zack and Cody as Pinky and the Brain fell on Pinky and the Brain as themselves.

Cody/Brain struggled with Brain/Cody, while Pinky/Zack held Zack/Pinky in his arms.

"Gee, this is what I look like huh?" Pinky/Zack said, "All small, furry, and naked? I think I should go back to my roots."

"Now, Professor!" Moseby commanded, as Professor Ruegger fired his machine.

Zack, Cody, Pinky, and the Brain are now all restored to their respective bodies.

"I'll be taking these misbehaving mice back to Burbank," Professor Ruegger said, "Sorry for any trouble they may have caused you."

"I don't think anyone's in as much trouble as Zack is right now," Moseby said.

"Me?" Zack asked, "Two lab mice hijacked our bodies and you're gonna blame this all on me?"

"Have a look," Moseby said, as Zack looked in the mirror at himself wearing nothing but his underwear.

"You might want to put on some clothes," Bailey giggled.

"If only Maya could see you now," Marcus said, "I guess you'll have to snapchat her in Africa."

Epilogue

Kirby was reunited with Buck.

"Oh, Buck, I'm so glad you're back, and not really Cody or a megalomaniacal mouse bent on world conquest." Kirby said, "and to celebrate, I made you a sandwich: your favorite, Swiss cheese on Gouda. So now that you're back, what do you want to do tonight?"

"The same thing we do every night, Kirby," Buck said slyly, "try to take over the world!"

They're Kirby!

They're Kirby and the Buck-Buck-Buck-Buck-Buck!

END

Notes:

-Marcus is back on the ship even though he left in the show.

-Professor Ruegger is named after the creator of Pinky and the Brain, Tom Ruegger.

-Pinky and the Brain theme composed by Tom Ruegger and Richard Stone.