Gifted cellist Alex Serian returns home to Los Angeles after 20 years on the road. Music, which has been the constant, all-consuming river of his life, begins to carry Alex on an adventure that will change him forever.
| Actor | Role |
|---|---|
 Pedro PascalAlex Serian | Alex Serian |
 Olivia WildeCarol Spedding | Carol Spedding |
 Eva VictorNadia Hynes | Nadia Hynes |
 Will ArnettAndy Serian | Andy Serian |
 Hank AzariaPeter Serian | Peter Serian |
 Alexa SwintonViviana Bren | Viviana Bren |
| KKaya RallsNot listed | Not listed |
 Erik GriffinNot listed | Not listed |
 JoBeth WilliamsNot listed | Not listed |
 Margarita LevievaNot listed | Not listed |
 Matthew LillardNot listed | Not listed |
 Adam RoseNot listed | Not listed |
| VVincent OppidoNot listed | Not listed |
 Eden EpsteinTheresa | Theresa |
 Miles AndersonHarold | Harold |
 Max AdlerHost | Host |
| BBam HallDallas Bartender | Dallas Bartender |
| AAlex ColemanNot listed | Not listed |
| AA.R. BjörklundNot listed | Not listed |
 Monroe RobertsonNot listed | Not listed |
 Eric SatterbergAssisted Living Doctor | Assisted Living Doctor |