The "Giant 2nd Dimension Heinz Doofenshmirtz Robot" was a giant robot modeled after and built by Heinz Doofenshmirtz from the 2nd Dimension.
Doofenshmirtz shows Heinz Doofenshmirtz the 1st Dimension Choo-Choo which Heinz owns and gives it to him, removing all the pain he had in the past. After this he destroys all the Norm Bots, and presumably this robot too, since It's nowhere to be seen after that.
Although modeled after Doofenshmirtz, the only part of the robot resembling the evil dictator is the head, which has a blue eye with red sclera and an eyepatch. The rest of the robot is of a black-colored material for the arms, legs and body and grey limbs. It also has two fingers and a thumb.
Although the robot never managed to showcase any noteworthy abilities, it could be said that it was pretty strong.
- "Phineas and Ferb The Movie: Across the 2nd Dimension" (First appearance)