While answering a mayday, the TARDIS passes through a mysterious cloud. Alarmed, Leela senses a malevolent presence that leaves the Doctor fighting for his mind. Could the key to survival come from Professor Marius and his dog-shaped computer, K-9...?
| Title | Time | Price | ||
|---|---|---|---|---|
| 1 | Invisible Enemy, Episode 1 | 23:08 | GBP 1.89 | Buy on iTunes |
| 2 | Invisible Enemy, Episode 2 | 25:13 | GBP 1.89 | Buy on iTunes |
| 3 | Invisible Enemy, Episode 3 | 23:15 | GBP 1.89 | Buy on iTunes |
| 4 | Invisible Enemy, Episode 4 | 21:22 | GBP 1.89 | Buy on iTunes |
