The friends hear the histories of Yookia and Zookia. Sam's desperate to connect with Pam, but a suspicious Guy doesn't trust her.

Sam shadows Pam on a super-secret spy mission, even though she'd rather work alone. In tech-loving Zookia, Guy finds an inventor's paradise.

Pam and Sam team up for an undercover job. A scampering squail leads E.B. to the top of the border wall, where she makes a mysterious new friend.

E.B. runs away to spend the day with Looka. Everything's perfect - until a hidden relic reveals the truth about the history of the wall.

Sam and his mom track the Moo-Lacka-Moo to a tropical island crawling with surprises. Guy gets Michellee's message and can't believe his eyes.

A well-meaning Guy saves E.B. from danger and shares his doubts about Pam with Sam - but it only seems to push them both further away from him.

So who gets the Moo-Lacka-Moo? With the fate of Yookia and Zookia hanging in the balance, the friends must decide where their loyalties lie.

Pam is forced to pick sides as the Zooks and Yooks prepare for an all-out war. A quick-thinking Michellee is Guy's secret weapon.

Butter side up, butter side down: The great butter battle is brewing! Can our heroes work together to stop it in time?