Planet (The Forgotten)

A planet with an unknown name was where a prison was located during the Last Great Time War.

History
The Doctor was imprisoned on the planet for over a month, from his cell he could see starships exploding in the sky. When he gained a new cellmate, Chantir, the Doctor managed to escape and steal the Great Key, which was kept inside the prison. The Doctor then released all the prisoners, which included Sea Devils among other species.

The Doctor then went to retrieve his TARDIS, which he had left a mile away from the prison. (IDW: The Forgotten)

Behind the scenes

 * The planet bore striking similarities with Gallifrey as it shared an orange sky, however the name of the planet was not revealed in the comic strip.