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.

After Scott the Undergrounder and Mrs. Murawski appear to hit it off and set up a date, Milo and the gang attempt to help the former look more presentable and normal.

Melissa and Zack become determined to get a good picture of Milo for school Picture Day after learning he's never had a good one due to Murphy's Law; but Chad misinterprets this as Milo being a vampire and recruits Mort to help him prove it. Meanwhile, Cavendish and Dakota get new jobs at P.I.G. (Paranormal Investigation Group) and try to capture a Yeti on camera to impress their new boss.

Doofenshmirtz reminisces on an adventure he had with Diogee the previous summer after the canine got caught up in an Agent P style mission.

Milo and his friends and family decide to finally attempt to finish a board game.

Milo and Elliot are the pace car drivers for a charity race.

Milo and Amanda get the chance to be on the latter's favorite TV show, Cake 'Splosion!, an extreme kids' cooking show.

Hollywood is rebooting the first Krillhunter movie with all women, so Milo and the gang help Tobias Trollhammer audition as a woman. Meanwhile, Cavendish and Dakota try to catch an alien while picking up trash by the highway.

Sara starts to go insane from Dr. Doofenshmirtz constantly invading her personal space, so he goes out with the rest of the Murphy family to try new things

Learning that the local skating rink is closing down, Milo convinces his parents to pursue their dream of winning a disco skating competition they were unable to finish years ago before that happens. Elsewhere, Cavendish and Dakota are assigned to pick up seemingly ordinary lawn gnomes from a little old lady.

Milo and his friends try to save the old clock at City Hall that Melissa's great-grandmother designed. Meanwhile, Doof tries to help the city by removing sidewalk gum under Agent P's supervision.

Amanda helps Milo, Zack, Melissa, and Mort prepare for an afternoon concert while aliens try to covertly study Milo. Elsewhere, Cavendish and Dakota find themselves losing time and not remembering why.

Doof shadows Milo to see how he navigates around Murphy's Law. Meanwhile, Cavendish joins an extraterrestrial conspiracy support group.

While Milo is sick, two shapeshifting aliens attempt to get a tissue sample. Meanwhile, under Monogram's orders, Agent P continues to keep Doof from doing harm while attempting to do good.

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.

While heading to a mentor program she doesn't want to be a part of, Melissa ends up paired with Savannah on a mission to stop a rampaging robot that Milo and Zack accidentally built at the science fair before it destroys half of Danville.

Elliott gets hurt because of a Murphy's Law related incident, so Milo helps him with his second job as a dog walker. Meanwhile, Cavendish and Dakota discover an alien anti-gravity device and try to show it to Mr. Block for a promotion.

After discovering a boombox in the attic, Milo, Martin, and Grandpa Murphy go camping so Milo can undergo a family rite of passage to become a "Murphy Man". While the men are away, the Murphy women and Doof go to an art museum to celebrate the day without Murphy's Law, but Doof causes chaos in its place.

After an incident with a skydiving simulator, Milo, Melissa, and Zack are left in a cycle of falling and rising through the sky while Diogee tries to save them. Meanwhile, Cavendish and Dakota, while flying a plane and trailing a "Don't Litter Our Planet" banner, accidentally gain rivals in the form of Colonel Niblet and Lieutenant Tenant after taking the blame for Milo and his friends destroying one of their facilities.

While waiting for Milo to come join them for lunch, Melissa, Zack, Bradley, Mort, Chad, and Sara present "Neil From the Comic Shop" with differing theories on what Milo really is; ranging from him being a wizard, a supervillain, and a robot.

Milo gets abducted by the recurring alien characters introduced this season, while Melissa, Zack, and Doof attempt to look for him. While on trash duty, Cavendish sees the abduction from a distance, but Dakota does not. This causes a large argument between them, which ultimately ends in the dissolution of their partnership and the former going rogue.

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.

After being told to go home again, Diogee crosses paths with Agent P and enemy agents after he swallows a flash drive disguised as a cookie. Meanwhile, Brigette makes Doof and Sara pick up dirty clothes, so the former builds a robot hamper-inator to do the job for them.

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.