- You may be looking for the slaves on Terminus.
The Vanir were a tribe of Vikings in 141. They were influenced by the Master under the alias of Frey to fight Odin and Thor and the Third Doctor so that he could get Gungnir, the Spear of Destiny. The Doctor explained to Jo Grant that Norse mythology probably came from real adventures of early Viking history such as this fight in 141. (PROSE: The Spear of Destiny)