| Thomas Middleditch | Richard Hendricks |
| 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 |
| Scott Prendergast | Scott |
| Rogelio T. Ramos | Executive
(as Rogelio Ramos) |
| Neil Casey | Colin |
| Tzi Ma | Yao |
| Aaron Sanders | Holden |
| Angela Ai | Interpreter |
| Chris Aquilino | Danny |
| Gatsby Coram | CHP Officer Gronski |
| Kunal Dudheker | Tholio Developer |
| Anna Khaja | Rachel |
| Alice Ko | Croupier |
| Henry Phillips | John |
| Rachel Rosenbloom | Becky |
| Eric Satterberg | Camper |
| Krishna Smitha | Priyanka Singh |
| Ping Wu | Henry |
| Paul Edney | Techie Camper
(uncredited) |
| James Quach | Casino Patron
(uncredited) |