- Writer:
- Harry Harrison
- Adaptor:
- Chris Boccher
- Barney Hendrikson (a film director):
- Lee Montague
- Professor Hewett (inventor):
- Richard Pearson
- L. M. Greenspan (the head of Climactic Studios):
- John Bay
- Dr Jens Lyn (a philologist):
- David March
- Ottar (a Viking):
- Michael Kilgarriff
- Slithey Tove (a film star):
- Karen Archer
- Ruf Hawk (another film star):
- Alexander John
- Charley Chang (a scriptwriter):
- Barry Dennen
- Tex (a stuntman):
- William Roberts
- Dallas (another stuntman):
- Crawford Logan
- Amory (a technical advisor):
- Don Fellows
- Gino (a cameraman):
- Sean Barrett
- Doody (a musician):
- Andrew Secombe
- Betty (a secretary):
- Patience Tomlinson
- Saa (an accountant):
- John Livesey
- Director:
- Glyn Dearman
