The first wave of an alien invasion coincides with a New Years Eve party in a Welsh valley.
| Actor | Role |
|---|---|
 Robert PughJenkins | Jenkins |
 Hannah DanielAgnes D | Agnes D |
 Kai OwenMcDonald | McDonald |
 Sheena BhattessaSunita | Sunita |
 Craig RussellSteve Dennis | Steve Dennis |
| RRobert BoulterRandall | Randall |
 Aled PughRyan | Ryan |
| DDominique DauweKurt Nesbo | Kurt Nesbo |
 Steven MeoHuw | Huw |
 Richard MylanNav | Nav |
 Sophie MelvilleSian | Sian |
 Laura SilberMedical Examiner | Medical Examiner |
| LLe Hong LienVietnamese Woman | Vietnamese Woman |
| TTsilala BrockMarcie Gilman | Marcie Gilman |
| CCeri JonesSelwyn Rees | Selwyn Rees |
| CChelsea McCarthyTechnician | Technician |
| RRob Karma RobinsonMiles Kendrick | Miles Kendrick |
| SScott BarrowStanley | Stanley |
| SSteve DunayerOfficer Colman | Officer Colman |
| MMarc RhysTommy | Tommy |
 Kevin McCurdyFisherman | Fisherman |
| OOliver Morgan-ThomasFisherman | Fisherman |
 Richard CorganWilson | Wilson |