Tranquility

Tranquillity was a planet visited by the Doctor and Heather McCrimmon however, the Doctor was shocked to find the planet in ruins. Joining the Bereft on their journey to the Eternity Canyon, the Doctor and Heather encountered T.R.O.L, the robotic creation of the Bereft's warlike ancestors. The Doctor traveled on T.R.O.L to the planet's crust and found a military bunker. He discovered an ancient bomb had caused tremendous damage to Tranquillity. The Doctor resettled the planet's defense shield so that the Bereft could escape before the bomb exploded and destroyed Tranquillity. After saving the population, the Doctor and Heather watched the destruction of Tranquillity from space, hopeful that Tranquillity would be reborn in a thousand years. (COMIC: T.R.O.L.)