Salcreyan Nebula

The Salcreyan Nebula was a nebula with a dramatic birth. The Doctor planned to visit it, but only got around to seeing it in his eleventh incarnation. He was pulled off-course by the Council of Dead and instead landed on Earth. After this encounter, he took Louie Rollins and Millie Peterson to see it with him. (WC: Attack of the Snowmen)