The other school kids, led by Melissa and Zack, throw a surprise birthday party for Milo at a go-kart arena.

Milo and Zack try to help Melissa overcome her secret fear of roller coasters.

At a donation drive, Milo accidentally gives away his mother's vintage T-shirts. Meanwhile, Cavendish and Dakota are assigned to protect the pistachios at the zoo.

Milo and Melissa finally tell Zack the story of the infamous Llama Incident.

Elliot Decker is hired as the school’s head safety monitor.

Milo begins to sleepwalk through some nearby woods. Meanwhile, Cavendish and Dakota have a "ditch day" from pistachio duties after their ordeal with the Pistachions.

Zack doesn’t think anything about Halloween can scare him anymore, but he didn’t account for Murphy’s Law.

Milo, Zack, and Melissa—with help from Phineas, Ferb, Candace, Buford, and Baljeet—help conquer Murphy's law to stop a swarm of Pistachions.

In a similar vein as "Going the Extra Milo", Milo and Zack attempt to survive Murphy's Law while getting to school on a cold winter day while Bradley and Melissa bet on whether they'll make it on time again. Meanwhile, Cavendish and Dakota are forced to stand before the Time Council for their constant failures, resulting in their being fired and having their ability to time travel revoked.

When his Uncle Cornelius asks for help on his farm, Zack seeks out to prove to a doubtful Milo and Melissa that a "city boy" like him can handle the job. Meanwhile, on a nearby farm, Cavendish and Dakota are assigned to pick up a fallen UFO piece from a farmer who wants to become famous in the tabloids.

Eons in the future, an elderly man tells his grandson how a sentient crockpot of goulash came to be and defeated an army of robot screech owls. Back in the past, Milo, his friends, and Doof attempt to protect Brigette's goulash from Murphy's Law and Doof's hand-held-inators.

Doof becomes inspired to find an "adventure buddy" to get over Agent P, and winds up joining Scott on a boat ride through the sewers.

Milo, Zack, and Melissa attend a camp to learn new skills. Elsewhere, Cavendish mistakenly unleashes a giant alien.

Milo faces down a cosmic storm made of negative probability ions, while Melissa, Zack, Cavendish, Dakota, Perry, and Doof work their way through the alien populace to save their friend.