Phineas and Ferb try to find a way to make everything fun, starting with their house.
Meanwhile, it's Dr. Doofenshmirtz and Perry's 100th battle, and the O.W.C.A. has set up cameras all over Doofenshmirtz Evil Incorporated.
Tropes present:
- The Cameo: Suzy and Jenny get a non-speaking one at the pet wash.
- Out-of-Character Moment: The sole purpose of Dr. Doofenshmirts inator, the "Least-Likelyinator".
- Red Eyes, Take Warning: Averted with the platypus from the zoo. It has red eyes so that it can be distinguished from Perry while he's in pet mode, but other than that it's just a regular platypus. However, Dr. Doofenshmirtz might tell you otherwise.