Brothers Jack and Oliver reunite to put their beloved dog to sleep. While their zany mother plans a party to celebrate Stella's life, things go awry when the brothers discover they love the same girl.
| Actor | Role |
|---|---|
 Nat WolffJack | Jack |
 Alex WolffOliver | Oliver |
 Paulina SingerViolet | Violet |
 Nick SandowRon | Ron |
 Polly DraperSally | Sally |
| JJulia AbuevaCassandra | Cassandra |
 Julia MacchioCaitlin | Caitlin |
 Leo HellerShark Boy | Shark Boy |
| LLisa DardenGlinda | Glinda |
 Patricia SquireSally's Mother | Sally's Mother |
| WWill CooperNew Agey Vet | New Agey Vet |
 Norm GoldenNeighbor | Neighbor |
| KKareem WilliamsParty Goer | Party Goer |
| AAlex DiMattiaRichard | Richard |
 Joshua SatineYoung Oliver | Young Oliver |
| SSimon MaxwellYoung Jack | Young Jack |
| SShawn Allen McLaughlinDad | Dad |
| KKelly SwintDancer #1 | Dancer #1 |
 Adam EnrightStage Manager | Stage Manager |
| CChristopher HalladayMarty | Marty |
| HHarriet WeaverCaroline | Caroline |
| SStellaStella | Stella |
| CCourtney Leigh GoodwinPedestrian (uncredited) | Pedestrian (uncredited) |