Violet Sabrewing

Brain is Penny's dog and despite being a dog, he is as clever as a human being. He is also her best friend and her sidekick and he always accompanies her to every mission. As always, he is a master of disguise and usually Gadget mistakes him for a MAD-Agent in disguise. In the German version he is called Fino.

Trivia

 * Brain is voiced by Scott McCord