Zetheda

Zetheda was a planet once visited by the Doctor and Martha Jones. On their visit they discovered that the whole planet was overflowing with un-recycled waste. The pair were then attacked by the Worgoth but were soon saved by the Ratlings - who sent the distress signal leading the TARDIS to Zetheda. The distress beacon also attracted the attention of the Optimi, a race of evolving humans who wanted to colonize the "paradise" world of Zethenda and destroy the Ratlings. Escaping, the Doctor, Martha and the Ratlings activated a terraforming device hidden underground that created a paradise landscape. In the end, the Ratlings and Optimi came to a compromise: the Ratlings would inhabit the wastelands, whilst the Optimi would live in the paradise they had been searching for. (COMIC: Waste Not)