The Doctor, Romana, Adric and K9 encounter the enslaved time-sensitive Tharils, who lead them to a white void occupied only by the ruins of an old building and a spaceship - a dimension that might be the key to escaping E-Space.
| Writing | Stephen Gallagher | Writer |
| Directing | Graeme Harper | Director |
| Directing | Paul Joyce | Director |
| Writing | Christopher H. Bidmead | Script Editor |
| Production | John Nathan-Turner | Producer |
| Production | Barry Letts | Executive Producer |
| Sound | Peter Howell | Original Music Composer |
| Costume & Make-Up | June Hudson | Costume Design |
| Art | Graeme Story | Production Design |
| Costume & Make-Up | Pauline Cox | Makeup Artist |
| Production | Graeme Harper | Production Assistant |
| Camera | Alec Wheal | Camera Operator |
| Crew | Dick Mills | Special Sound Effects |
| Lighting | John Dixon | Lighting Director |
| Sound | Alan Fogg | Sound |
| Editing | Rod Waldron | Editor |
| Visual Effects | Robin Lobb | Visual Effects |
| Visual Effects | Mat Irvine | Visual Effects |
