Professor Mystery is a fictional character portrayed by Terry O'Quinn in the TV series Phineas and Ferb.
In the first episode they appeared in, titled Lost in Danville/The Inator Method (season 4), they were 62 years old.
They appear in 1 episodes out of a total of 130 aired
Episodes1
Lost in Danville/The Inator Method
episode S4.E25 september 2014A capsule falls from the sky into Phineas and Ferb's backyard. Doofenshmirtz gets kidnapped by Professor Mystery who is Peter the Panda's real nemesis.