In this animated intergalactic adventure, the red Smeds and the blue Smoos must learn to overcome their differences and work together to find young Janet and Bill – who eloped to escape their families’ long standing rivalries.
| Actor | Role |
|---|---|
 Sally HawkinsNarrator (voice) | Narrator (voice) |
 Bill BaileyGrandfather Smed (voice) | Grandfather Smed (voice) |
 Ashna RabheruJanet (voice) | Janet (voice) |
 Adjoa AndohGrandmother Smoo (voice) | Grandmother Smoo (voice) |
 Daniel EzraBill (voice) | Bill (voice) |
 Meera SyalAunt Smed (voice) | Aunt Smed (voice) |
 Rob BrydonUncle Smoo (voice) | Uncle Smoo (voice) |
| RRaphaella CrowYoung Smoo (voice) | Young Smoo (voice) |
 Ashwin SakthivelYoung Smed (voice) | Young Smed (voice) |
 David HoltAdditional Voices (voice) | Additional Voices (voice) |
| LLizzie WaterworthAdditional Voices (voice) | Additional Voices (voice) |