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.
| Editing | Tony Lenny | Editor |
| Writing | Tony Barwick | Writer |
| Editing | Alan Killick | Editor |
| Writing | Gerry Anderson | Writer |
| Sound | Richard Harvey | Music |
| Production | Christopher Burr | Producer |
| Directing | Desmond Saunders | Director |
| Production | Gerry Anderson | Producer |
| Visual Effects | Steven Begg | Visual Effects |