Metebelis IV

Metebelis IV, or Metelbelis Four, (PROSE: ) was a planet that drifted out of its orbit into the outermost ring of the Acteon Galaxy. It was a barren, untouched paradise with cerise coloured sands and emerald skies. (AUDIO: The Vanity Trap)

The Thirteenth Doctor considered it to be "better than Metebelis III but nowhere near as good as Metebelis I or II". The sands of the planet were infused with a substance which could block a Zeiton tracker. Metebelis IV was also stated to be "somehow alive, as if its natural elements [were] sentient...". (GAME: The Edge of Reality)

History
The Sixth Doctor intended to go there with his companion Peri Brown, but instead landed on Earth. (AUDIO: The Vanity Trap)

Behind the scenes

 * Prior to the release of The Vanity Trap Metebelis IV appeared in the virtual reality video game The Edge of Time. In the game, Metebelis IV was a sentient planet that was the site of the Temple of the First and was invaded by Bronze Daleks seeking to harness the power of zeiton crystals. The Thirteenth Doctor and a companion controlled by the player both go to the Temple.
 * The short story, It's Raining Gin, (part of the Curse of Fanfic! charity anthology published by Obverse Books), showed that Sooty, Sweep, and Soo (the puppets from the ) were good friends of Iris Wildthyme and Panda, having several adventures together. The story would give an explanation as to why Sooty is mute - as Wombats from Metebelis IV stole his voice.