| Name | Character | Episodes |
|---|---|---|
| John Mills | Bernard Quatermass | 4 |
| Simon MacCorkindale | Joe Kapp | 4 |
| Jane Bertish | Bee | 4 |
| Ralph Arliss | Kickalong | 4 |
| Toyah Willcox | Sal | 3 |
| Rebecca Saire | Hettie Carlson | 3 |
| Brenda Fricker | Alison Thorpe | 2 |
| Neil Stacy | Toby Gough | 2 |
| David Yip | Frank Chen | 2 |
| Annabelle Lanyon | Isabel | 2 |
| Margaret Tyzack | Annie Morgan | 2 |
| Barbara Kellerman | Clare Kapp | 2 |
| Brewster Mason | Gurov | 2 |
| James Ottaway | Arthur | 2 |
| Gretchen Franklin | Edna | 2 |
| Bruce Purchase | Tommy Roach | 2 |
| Elsie Randolph | Minister | 2 |
| Brian Croucher | Pay Police Lt. | 1 |
| Stewart Harwood | Taxi Driver | 1 |
| Ishaq Bux | Misru | 1 |
| Declan Mulholland | Security Guard | 1 |
| David Ashford | David Hatherley | 1 |
| Charles Lamb | Orderly | 1 |
| Kevin Stoney | Prime Minister | 1 |