The Fifth Doctor travels to Sea Base 4 to show his companions Earth's future. He attempts to prevent conflict with the Silurians, destroys the Myrka using a UV generator, and ultimately floods the base with hexachromite gas to stop the alien threat. He later switches the gas to oxygen to save the creatures and interfaces with the control system to halt the missile launch.
The Doctor and Vorshak eventually cooperate to prevent a global nuclear war.
Preston seeks the Doctor's tactical expertise during the alien assault.
Bulic assists the Doctor in deploying the hexachromite gas to neutralize the threat.
The Doctor directly confronts and neutralizes Nilson's sabotage efforts.
Explore the full interactive character relationship map of Doctor Who: Warriors of the Deep