A seemingly incurable disease is gradually weakening the people of Theros. The Doctor and his companions travel with Grig, a Therovian astronaut to the planet Ixon where a moss grows that might provide an antidote.
- John and Gillian watch what is happening outside the ship through what appears to be a circular window. This is, presumably, the TARDIS scanner.
- The Doctor states that the Therovians to use the TARDIS because its controls are damaged.
- This story was reprinted in DWCC 12 in colour.
- This is the first comic story to use the term "TARDIS" to describe Dr. Who's time machine.
to be added