The Doctor (Tom Baker) and Leela (Louise Jameson) are accompanied only by K-9 as they board the R1C space vessel. Here, they encounter a group of Minyans, a population long believed to be extinct. These Minyans are searching for the genetic key to continue their race, a search that leads all parties to a new planet. This episode of the British science fiction series features some memorable low budget effects with actors superimposed upon sets. A trippy experience in the DOCTOR WHO cannon.