Teddy is Mitchell Pritchett's ex-boyfriend who invites the whole family to a fundraiser event at the roller skating rink in "My Hero". He was the only significant boyfriend Mitchell had before meeting Cameron.
Cam originally had no problem with Teddy, even convincing Mitchell to go to Teddy's fundraiser. He later starts to dislike Teddy when he finds out how close he is with Mitchell's family.
Jay tells Cam that although the whole family likes Teddy, he really didn't bring out the best in Mitchell and Jay was glad when they broke up.