The Louds and Casagrandes are finally on board the SS Aqua Voyager, where they all get to their respective cabins.

The Louds go into their cabin inside the ship while the Casagrandes are just across.

The Louds make themselves at home in their cabin.

Lynn sits back on the couch, throws away her shoes and says "Ah, yes. Time to sit back and re-energize."

"OK, kids. Remember to use plenty of sunscreen today. You don't wanna get sunburnt." said Rita.

"Mom, please. I'm too much of a star to use that oily, messy gel." said Lola.

Leni looks out the window and says "Guys, I don't see any roads outside. How is this thing driving on water?"

"You're thinking of a land vehicle, Leni. This oceanic vehicle does not require any wheels. It only floats on the open water." said Lisa.

"Really?" asked Leni.

Meanwhile, at the Casagrande's cabin, they settle in themselves.

"Oh, I can't wait to take a selfie on the poop deck, which is a really weird name." said Carlota.

"And I can't wait to take the most memorable pictures of our familia having fun. It could be the only fun thing we'll ever do before you kids drift apart for... college!" said Frida before doing her trademark crying.

Maria and Arturo go into a bedroom together (just as friends).

"Well, then. It appears we're both stuck in the same bed. Kinda loco, huh?" said Arturo.

"Yeah. But just as friends, right?" said Maria.

"Sí. Only as amigos." said Arturo.

Carl goes to his bedroom pulling his suitcase, which is heavy for some reason.

"Why is my suitcase so darn heavy?" groaned Carl.

He places it on the bed.

"What the heck did I pack in there? All I packed was my El Falcon comics, my sweet collection of cool sunglasses and-" said Carl before opening his suitcase and gets startled by the appearance of Sergio popping out.

"SERGIO?!" shouted Carl.

"SQUAWK! Stowaway!" said Sergio.

Carl pulls Sergio's beak and says to him "What are you doing here, Sergio?"

"Squawk. I snook in." said Sergio.

Flashing back to the apartment building at Great Lakes City, Lalo was waving goodbye without realizing next to him that Sergio was just a poorly made decoy puppet.

The head falls off, and Lalo notices.

He is perplexed.

Back to the present, Sergio says "Squawk! Outta my way. An all-you-can-eat buffet is calling my name."

Sergio was about to leave the bedroom when Sergio pulls him back.

"Are you out of your mind, Sergio? This ship has a no-pet policy. If you get caught, you'll be kicked out onto the open sea."

Then, Carlos knocks on the door and says "Hello? Is someone in there?"

"Oh, no. It's dad. Quick! Back in the suitcase!" said Carl as he forced Sergio back into the suitcase.

"Hey, watch the feathers." said Sergio before Carl closes the suitcase before Carl pops his head in.

"Are you alright, son? I thought I heard somebody else." said Carl.

"Uh... no. That was... uuuuhhhh... me doing... impressions... for... bisabuela's birthday." said a sweating Carl.

"You're doing voice impressions for your bisabuela's birthday, which isn't for another 11.4 months?" said Carlos.

"Yeah. Exactly. I'm just trying to make bisabuela laugh." said Carl.

"Well, alright then. I'm proud of you to prepare some light entertainment for Mama Lupe." said Carlos before he leaves.

Carl sighs in relief while Sergio again pops out of the suitcase.

"You could've just cut out air holes." said Sergio.

"Alright, look. It's obvious you'll get caught stowing away, so we just need to find you a disguise. Hmm." said Carl as he starts pondering.

He sneaks out of his bedroom and secretly takes Hector and Carlos' suitcases.

He brings them back and scatters all sorts of clothes.

He gives Sergio a green shirt, a blue-and-red tie, a black shirt, gloves, a hat, sunglasses and a mask with a human face.

"Ugh. Why would abuelo have a mask with a human face?" said Carl.

"OK. How do I look?" asked Sergio.

Carl shows him a mirror to see his disguise.

"Wow. I'm a human being now." said Sergio.

"And you just need to stay like that for the rest of the voyage. Got it?" said Carl.

"You have my word. Now, off to the buffet for me." said Sergio before taking off.

"Sergio, stop! You're not supposed to fly." said Carl.

"Really? Oh, double summer bummer." said Sergio.