Alex, Zara, and Joshua have funny school misadventures. They learn about friendship while dodging teachers. Their bond is strong.
In detention, Zara jokes that being with Alex and Josh is like a villain origin story. Alex explains his tape prank on bully Tony led to Mrs. Garbo following the tape line. Zara extends it, leading Mrs. Garbo to them. They run into Josh, and all three get detention, arguing over whose fault it was. The bell rings before Mrs. Garbo can tell her side.
Alex writes a note to Clem, but is too nervous to deliver it. Zara and Josh try to help by sticking it on her locker. They hide to watch, but Alvin finds it first, thinking it's for him, but then rejects it to focus on his genius plans. Tony then slips on it and assumes it's for him. Finally, a girl rips it up, revealing Josh put it on the wrong locker. Alex decides to tell Clem face-to-face, but when she appears, he panics and runs away.
The Trouble Trio finds Alvin and Tony at their usual table, sparking disbelief and a mission to reclaim their spot. They try various tactics, from polite requests to sneaky maneuvers, but Tony thwarts them all, even reducing Mr. Williams to tears. Alex finally confronts Tony, leading to a tense standoff where Tony surprisingly yields, ditching Alvin in the process. The Trio reclaims their table, but the bell rings, leaving them no time to eat.
Alvin’s constant snitching overfills detention, uniting the Trio and the bully in frustration. They form a truce to stop Alvin, planning to teach him about the impact of his actions and restore order to the school.
In a Valentine's Day prank orchestrated by Joshua, Alex finds a love letter in his locker, seemingly from Zara and signed with her name. The situation makes Alex uncomfortable because he actually has feelings for Clem, not Zara.
During a dodgeball game, Josh, Zara, and Alex try to trick Tony by pretending he has a call. The plan fails when Josh gets hit instead. Coach Mr. Carter uses the moment to teach them about teamwork and fair play.
For "Animal Clothing Day," Alex and Zara plan a prank. Josh wears a full lion onesie, and everyone laughs at him, even the teachers. Seeing Josh upset, Alex and Zara realize their prank went too far and apologize, learning that some jokes can be hurtful.