| Thomas Middleditch | Richard Hendricks |
| T.J. Miller | Erlich Bachman |
| Josh Brener | Nelson 'Big Head' Bighetti |
| Martin Starr | Bertram Gilfoyle |
| Kumail Nanjiani | Dinesh Chugtai |
| Amanda Crew | Monica Hall |
| Zach Woods | Donald 'Jared' Dunn |
| Matt Ross | Gavin Belson |
| Suzanne Cryer | Laurie Bream |
| Jimmy O. Yang | Jian Yang |
| Stephen Tobolowsky | Jack Barker
(credit only) |
| Chris Diamantopoulos | Russ Hanneman
(credit only) |
| Sunkrish Bala | Garrett |
| Vanessa Marano | Stanford Student |
| Demetri Belardinelli | Brett Saxby |
| Chau Long | Stanford Student
(as Chaz Kao) |
| Taylor F. Bailey | Stanford Student
(uncredited) |
| Emily Brooks | Hot Girl in the Car
(uncredited) |