Dennis maakt deel uit van een praatgroep die zich richt op mensen die een tweelingbroer of -zus hebben verloren. Daar ontmoet hij een andere rouwende man met wie het goed klikt. Beiden worstelen ze om aansluiting te vinden met anderen en kennen ze eenzaamheid. Over zichzelf ontdekken ze enkele pijnlijke waarheden.
Nee, helaas is Twinless nog niet beschikbaar op Netflix in Nederland.
| Production | Elizabeth Destro | Executive Producer |
| Production | David Permut | Producer |
| Production | David Gendron | Executive Producer |
| Directing | James Sweeney | Director |
| Production | Ali Jazayeri | Executive Producer |
| Writing | James Sweeney | Screenplay |
| Production | Alex Astrachan | Co-Producer |
| Production | 이미경 | Executive Producer |
| Editing | Nikola Boyanov | Editor |
| Production | Dylan O'Brien | Executive Producer |
| Camera | Greg Cotten | Director of Photography |
| Production | James Sweeney | Producer |
| Production | Kevin Sullivan | Executive Producer |
| Art | Priscilla Elliott | Production Design |
| Sound | 정재일 | Original Music Composer |
| Sound | Lauren Fay Levy | Music Supervisor |
| Production | Jessica Munks | Casting |
| Art | Sean Roney | Art Direction |
| Art | Vanessa Knoll | Set Decoration |
| Costume & Make-Up | Erin Aldridge Orr | Costume Design |
| Costume & Make-Up | Jessica Needham | Makeup Department Head |
| Costume & Make-Up | Jennifer Serio | Hair Department Head |
| Directing | Kyle LeMire | First Assistant Director |
| Directing | Devan Linforth | Second Assistant Director |
| Sound | Trevor Gates | Sound Re-Recording Mixer |
| Sound | Trevor Gates | Supervising Sound Editor |
| Visual Effects | David Van Dyke | Visual Effects Supervisor |
| Crew | Kent W. Luttrell | Stunt Coordinator |
| Production | Simon Max Hill | Local Casting |
| Production | Adam Rosko | Extras Casting |
| Costume & Make-Up | Dionne Barens | Assistant Costume Designer |
| Editing | Lynsie Cook | Assistant Editor |
| Directing | Yona Prost | Script Supervisor |
| Production | Kevin Sullivan | Unit Production Manager |
| Crew | Conner Deadrick | Stunts |
| Crew | Harley Reed | Stunts |
| Art | Lisa Ward | Art Direction |
| Art | Jenelle Giordano | Set Decoration Buyer |
| Camera | Philip A. Anderson | Camera Operator |
| Camera | Philip A. Anderson | Steadicam Operator |
| Sound | Christian Dolan | Production Sound Mixer |
| Lighting | Mike Vukas | Chief Lighting Technician |
| Lighting | Borek Minarik | Lighting Technician |
| Camera | T.G. Firestone | Additional Camera |
| Costume & Make-Up | Anne Sellery | Key Makeup Artist |
| Sound | Andy Hay | Sound Re-Recording Mixer |
| Sound | Andy Hay | Supervising Sound Editor |
| Sound | Pavel Nivevskiy | Foley Mixer |
| Sound | Ian Yeromenko | Foley Artist |
| Sound | Игорь Яшин | Foley Editor |
| Visual Effects | Shane Strickman | Visual Effects Producer |
| Crew | Julio Perez IV | Thanks |
| Sound | Creed Spencer | Boom Operator |
| Sound | Scott Hedrick | Music Editor |
