Dean is a WOOHP agent who first appeared in "Evil Promotion Much?" as their trainer, and was later shown in "Déjà Cruise" as Jerry's sidekick for the girls' Super Agent Human Assets Test. The girls have shown some romantic interest in Dean and he is the only boy who can resist Clover. At the end of the aforementioned episode, Dean revealed that he was a triple agent. He pretended to be on Terrence's side in order to trick Terrence while also saving Jerry and the girls.
Personality wise, Dean comes across as a "player" as in his very first appearance he tells the girls who are fighting over him that there is quote "plenty of Dean to go around" for all of them. Dean is the only male WOOHP agent other than Jerry (and later, Blaine) to play a substantial role in the series. Dean made 2 appearances in Season 5 towards the end of the series. In the episode "WOOHP-tastic!", he was in charge of the gadget lab at WOOHP. He was both present at and took part in the final battle of the Season 5 finale in "Totally Dunzo".
His catsuit is dark blue.
- Dean is voiced by Greg Cipes, also known for voicing Beast Boy in "Teen Titans", Michelangelo in "Teenage Mutant Ninja Turtles", Caleb in "W.I.T.C.H." and Kevin Ethan Levin in "Ben 10: Alien Force" up to "Ben 10: Omniverse".
- He appeared in "Operation Spy-Sitter" and "Operation Dude Ranch Disaster" in "The Amazing Spiez".