Thedion Four

This topic might have a better name.

Thedion 4

Talk about it here.

Thedion Four was a planet with constant acid rain. The Doctor once had a picnic there while wearing a gas mask. The Twelfth Doctor mentioned this to Clara Oswald and was accused of lying by Maisie Pitt as, by that time, the planet had been destroyed for thousands of years. (TV: Mummy on the Orient Express)