| Thomas Middleditch | Richard Hendricks |
| T.J. Miller | Erlich Bachman |
| Josh Brener | Nelson 'Big Head' Bighetti
(credit only) |
| Martin Starr | Bertram Gilfoyle |
| Kumail Nanjiani | Dinesh Chugtai |
| Amanda Crew | Monica Hall |
| Zach Woods | Donald 'Jared' Dunn |
| Matt Ross | Gavin Belson
(credit only) |
| Suzanne Cryer | Laurie Bream |
| Jimmy O. Yang | Jian Yang |
| Stephen Tobolowsky | Jack Barker
(credit only) |
| Chris Diamantopoulos | Russ Hanneman |
| Jake Broder | Dan Melcher |
| Leisha Hailey | Liz Tinsdale |
| Haley Joel Osment | Keenan Feldspar |
| Seril James | Jeff |
| Amir M. Korangy | George Mandechian, CEO
(as Amir Korangy) |
| Robert Michael Lee | Dupondi Consulting Executive |
| Jeff Marlow | Christoff |
| Artie O'Daly | Charles |
| Carrie Reeves | Dupondi Consulting Executive |
| Nate Shelkey | Executive |