Seth Benjamin Green is an American actor. He has worked with Dan Povenmire in the past, voicing Monty Monogram in Phineas and Ferb. Green is also well known for being the creator of the Adult Swim series Robot Chicken, and the voice of Chris Griffin in Family Guy (in which Dan Povenmire previously worked on as a director & storyboard artist during Season 2 to Season 5).
For Hamster & Gretel, he voices Footkicker.[1]