Doofenshmirtz's Mecha

"Doofenshmirtz, your pathetic schemes have all failed. Step aside and let the true master take over!"

- The mecha rebelling against Doofenshmirtz.

Doofenshmirtz's Mecha is the main antagonist of the Phineas and Ferb episode Phineas and Ferb-Busters!. It was a small robot that used to serve for Heinz Doofenshmirtz, but later rebelled against him after being turned into a giant mecha caused by a power surge.

Role
When Doofenshmirtz starts to tire himself of Norm's antics (especially the time when Norm accidentally poured coffee on Doof's lap after tripping on a rug), he bought a tiny robot and is very impressed for its blender attachment of making tasty smoothies. As Perry the Platypus heads by to Doofenshmirtz's place, Doofenshmirtz traps Perry in a straitjacket, stating that it was hand-made by the robot itself. Doof takes pride for the robot for its competence as it happens to be more stronger and efficient than Norm (despite its small size). Unknown to Doof, Norm overhears this from the closet and is very heartbroken.

Needless to say, a power surge (caused by Phineas and Ferb's large spinning tops) struck around Danville, causing many electronic appliances to run amok and create havoc for the citizens. As such, Doofenshmirtz's robot was affected by the power surge and transformed itself into a giant mecha, much to both Doofenshmirtz and Perry's surprise. With a new sentient personality developed by the power surge, the mecha rebelled against Doofenshmirtz and attempts to put him down by shooting with lasers, forcing to latter to flee. Perry frees himself from the straitjacket and attempts to fight the mecha to save Doof, but the annoyed mecha just flicks off Perry from the building before turning his rage towards Doof, much to Perry's dismay.

Grabbing Doof by the lab coat, the mecha attempts to kill him by putting him into the blender. Doofenshmirtz calls out for Norm to help him, but Norm refused as he seemingly had enough of Doof putting him down and wants to make coffee for the mecha as his new boss. However, Norm seemingly slips again and the coffee spills onto the mecha, shortening it out. This allows Doofenshmirtz to jump off safely into Norm's hands while the mecha falls to the floor deactivated. Eventually, Norm pointed out that there was no rug to slip on this time, which made Doofenshmirtz realize that Norm purposely spilled the coffee to destroy the mecha to save him.

With the mecha destroyed, Doofenshmirtz thanks Norm and apologizes for being so hard on him. It was also revealed that Norm ran on squirrel power, which can explain why he was impervious to the power surge, prompting an impressed Doof to check through Norm's operation manual. Perry would later find the source of the power surge and destroyed it to ensure that it wouldn't happen again.