Professor Mystery

The  is the same guy that kidnapped Doofenshmirtz from his evil lair. He was first seen when Perry opened the door to see that the lights are out, the reason for this being, Doofenshmirtz was kidnapped overnight, and when the flashback - that for unknown reasons - is in black and white starts, he is seen kidnapping Doofenshmirtz while he was still on his evil blog. He puts Doofenshmirtz in a barrel trap. Finding this creepy, Doofenshmirtz wakes up to realize that he was kidnapped.

Appearances

 * "Lost in Danville