Milo, Melissa, Zack, Clyde Rickenbacker and C.I.D.D. try to get Old Bessie, a city hall clock designed by Melissa's great-grandmother, working again before Victor Verliezer can legally level it. Meanwhile, Perry the Platypus has to keep an eye on Dr. Doofenshmirtz cleaning up the streets from gum.
Tropes:
- The Bus Came Back:
- Clyde Rickenbacker and C.I.D.D. return after being seen in Season 1.
- This is also Victor Verliezer's second appearance from the first season.
- Chekhov's Gun: Doofenshmirtz's inator ends up serving as a new motor for Old Bessie.
- Corrupt Corporate Executive: Victor Verlizer tries to sabotage Old Bessie's repairs so he can build a better tower and be paid by the town to upgrade it until it becomes a giant Killer Robot.
- Impact Silhouette: Doof leaves an outline of himself and his invention when he backs the De-gum-inator through a door, a fence, and a shrub.
- Mythology Gag: The gag with the substitute teacher's convention is a nod to the Phineas and Ferb special "Summer Belongs to You!".
- Nice Job Breaking It, Hero: Doofenshmirtz unknowingly causes trouble while cleaning gum off the sidewalks of Danville, with his De-Gum-Inator causing a lot of property damage and even taking gum while people are still chewing it.
- Race Against the Clock: Once Old Bessie stops working, it must be repaired within the next 24 hours or its owner will be legally allowed to level it.
- Tempting Fate: After Victor Verlizer is defeated, he asks what else could go wrong and a giant ball of gum hits him.
