| MMarius HisleTheydy in the Radiator (Scene 29) | Theydy in the Radiator (Scene 29) |
| IIsaac FensterHenry Spencer (Scene 29) | Henry Spencer (Scene 29) |
| TTrey LaneHenry (Scene 1) | Henry (Scene 1) |
| JJeremy CrumpThe Man in the Planet (Scene 2) | The Man in the Planet (Scene 2) |
| SSarah RuthlessHenry (Scene 3) | Henry (Scene 3) |
| AAmmon MillerHenry (Scene 4) | Henry (Scene 4) |
| CCami WelchWoman Across the Hall (Scene 4) | Woman Across the Hall (Scene 4) |
| JJanely MartinezAdditional Voice (Scene 4) | Additional Voice (Scene 4) |
 Christopher BrownChris Brown (Scene 6) | Chris Brown (Scene 6) |
| SSarita MalanWife (Scene 6) | Wife (Scene 6) |
| KKyle KitagawaKyle Kitagawa (Scene 6) | Kyle Kitagawa (Scene 6) |
| MMilo SimonHenry (Scene 7 & 8) | Henry (Scene 7 & 8) |
 Matthew MacGyverHenry (Scene 10) | Henry (Scene 10) |
| MMatty LeclairMary X (Scene 10) | Mary X (Scene 10) |
| AAlex RatkovicMrs. X (Scene 10) | Mrs. X (Scene 10) |
| MMike WoodHenry (Scene 11) | Henry (Scene 11) |
| CChristina RiceMary (Scene 11) | Mary (Scene 11) |
| DDaniel SmithHenry (Scene 12) | Henry (Scene 12) |
| NNaomi DuVallMary (Scene 12) | Mary (Scene 12) |
| VVince TulaHenry (Scene 13) | Henry (Scene 13) |
| SShelby ConzelmanMary X (Scene 13) | Mary X (Scene 13) |
| GGia Taleen Dre TlasecaBaby (Voice) (Scene 13) | Baby (Voice) (Scene 13) |
| MMatty LeclairBeautiful Girl Across the Hall (Scene 15) | Beautiful Girl Across the Hall (Scene 15) |
| AAustin MombourquetteHenry (Scene 15) | Henry (Scene 15) |
| SSarita MalanBaby (Scene 15) | Baby (Scene 15) |
| AAdam Riot ThornHenry (Irritable Bowels) (Scene 16) | Henry (Irritable Bowels) (Scene 16) |
| AAlex RatkovicLady in the Radiator (Scene 17) | Lady in the Radiator (Scene 17) |
| DDorian LoganHenry (Scene 19) | Henry (Scene 19) |
| SSylvie SoulBeautiful Girl Across the Hall (Scene 19) | Beautiful Girl Across the Hall (Scene 19) |
| AAnna BolinLady in the Radiator (Scene 20) | Lady in the Radiator (Scene 20) |
