A classic episode from the long running BBC television series. A scientist who was raised by robots has created several races of robots. The strongest race is discovered by the Doctor and sexy warrior Leela to be systematically eliminating the human crew members of a mining ship. A helium tank provides for a clever climax to the 90th episode of the nearly 700 in this beloved science fiction series. The Doctor is played by Tom Baker, the fourth actor to tackle the role. Watch for Brian Croucher from BLAKE'S 7 as Borg.