The first four episodes of Gerry Anderson's 1980s Supermarionation series. In 'Expect the Unexpected (Part 1)' Queen Zelda attacks and destroys a NASA Mars expedition. 'Expect the Unexpected (Part 2)' sees Zelda offer to make peace with the Terrahawks. 'Thunder Roar' finds the Terrahawks battling the mighty Sram, Lord of Felony. 'Close Call' has an investigative reporter threatens to expose the Terrahawks on worldwide television.
Unfortunately the movie Terrahawks: Expect the Unexpected is not yet available on HBO Max.
| Writing | Gerry Anderson | Writer |
| Production | Gerry Anderson | Producer |
| Directing | Desmond Saunders | Director |
| Writing | Tony Barwick | Writer |
| Editing | Alan Killick | Editor |
| Editing | Tony Lenny | Editor |
| Visual Effects | Steven Begg | Visual Effects |
| Production | Christopher Burr | Producer |
| Sound | Richard Harvey | Music |