Dr. Shell

Dr. Cooper is a character from Phineas and Ferb and is a secondary antagonist in Knights of the Multiverse Season 1. He's a member of the evil organization L.O.S.R. and is a failed clone of Dr. Cooper. He's also the creator and main operator of Balatack.

Personality
Being a perfect clone of Cooper, Shell maintains his original counterpart's stubbornness and egotistical attitude, which leads him to do things he feels is right before informing his superiors about it. And of course, it was this attitude that got him killed.

Pre-Series
It is unknown to most people when Dr. Shell was created, though most theorize it was due to some kind of teleportation incident. He took part in L.O.V.E.M.U.F.F.I.N.'s plan to pull the Earth away from the sun and start a new Ice Age, but aside from that, he never did anything else of real... importance.