Scott Halberstadt as Eric Blonowitz, Josh's other friend.Alec Medlock as Craig Ramirez, Josh's friend.Allison Scagliotti as Mindy Crenshaw, Josh's girlfriend and ex-science fair rival.
Jerry Trainor as "Crazy" Steve, employee at the Premiere.
Yvette Nicole Brown as Helen Dubois, manager of the Premiere movie theater (portrayed by Frances Callier in season 2, episode 7 "Little Diva").