The owner of the Comic Center.
Stuart is an artist who went to the Rhode Island School of Design. His greatest claim to fame, at least according to Sheldon, is that he gets "45% off comic books" (0220, 0222). He has an uncle who is a dermatologist and treats Stan Lee (0316).
In April 2009 he has two dates with Penny. Thereafter, he has something of a crush on her (e.g. 0307).
In October 2009, he was Wil Wheaton's partner in the Mystic Warlords of Ka'a tournament at the store.
In February 2010 he organises an signing by Stan Lee in the Comic Center.
In April 2010 his bowling team is one member short, so he enlists Wil Wheaton to play against Sheldon's team (0319).
In July 2010 he meets a girl at Comic-Con who becomes his girlfriend. He later admits that he finds her rather terrible (0405).
Stuart is played by Kevin Sussman.