Genesis of the Daleks and Exploration Earth
Exploration Earth
Released
Monday, October 4, 1976
Written by
Bernard Venables
Runtime
60 minutes
Synopsis
The TARDIS takes the Fourth Doctor and Sarah back in Time to witness stages of the Earth's development. However, as the planet evolves from a mass of heat and gas, Megron the High Lord of Chaos has his own designs on our homeworld. If his threats to endanger the stability of Earth have any substance, the existence of mankind itself is in question!