Elder Silurian: I have decided that it is possible for the two species to live together on this planet.
Young Silurian: This planet is ours!
Elder Silurian: This other species has developed its own civilisation. We must accept them as equals.
Young Silurian: I disagree! We must destroy them!
The Doctor: Brigadier, at all costs we must avoid a pitched battle.
The Brigadier: You don't still think we can co-exist with the Silurians, do you?The only Doctor Who TV story to be officially titled "Doctor Who and...". Legend has it this was due to an error by the production team in putting the prefix onto the onscreen titles. (The title format stuck for the Target Doctor Who Novelisations, and was parodied by Big Finish a few times.) While "Doctor Who" isn't his name, the actor was credited as playing "Dr Who" until 1970 and "Doctor Who" until 1981 (and again in 2005), so the Word of God on the subject is clearly a bit suspect. However, this could still be backed up by the fact that nearly all '60s stories were submitted under the title "Doctor Who and the...", even though they weren't televised as such until this story.Anyway, the Brigadier sends for the Doctor and Liz to take a look at an underground laboratory working on a new kind of nuclear reactor. They're getting odd power losses, a bizarrely high level of stress-related illnesses among the staff, and a background music composer with an inexplicable kazoo obsession.The Doctor investigates while Liz spends most of the story just sort of standing there, and they discover that a neighbouring cave system is the base for a group of intelligent reptilian bipeds which are (inaccurately, as it turns out) named "Silurians" from the geological period from which they date. They have been in hibernation for millions of years, but the power and heat from the new reactor have reactivated them, and they now wish to emerge and reclaim "their" world from the mammals.The Doctor tries to broker peace and gains the trust of the Silurian leader, but the leader's rebellious son takes power and releases a virus that will destroy humanity. The Doctor and Liz find a cure, but are then told that the Silurians have taken over the underground lab and are going to destroy the Van Allen Belt, bombarding the Earth with radiation deadly to mammals, but not reptiles. The Doctor gets them to retreat back into the caves by overloading the reactor and threatening an explosion. The Brigadier — to the Doctor's disgust — then orders the Silurian base destroyed.