Planet (The Discourse of Flies)

From Tardis Wiki, the free Doctor Who reference

A planet was home to a humanoid species that worshipped the Eternal Machine.

The Machine was in reality an alien that had crashed on the planet. It influenced the development of the planet's civilisation, manipulating the people. When the Third Doctor and Sarah Jane Smith visited the planet, they exposed the religion as a lie. (PROSE: The Discourse of Flies)