Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-27501528-20160110141624

Off the top of my head, instances where these sort of 'cliffhanger' character introductions appear: The 10th Doctor in The Parting of the Ways (if we're counting post-regeneration scenes as 'new guest star' introductions) Donna Noble in Doomsday Simms' Master in Utopia The Ood in The Waters of Mars (if that counts) The 11th Doctor in The End of Time Churchill in The Beast Below Kovarian in The Almost People and Closing Time The War Doctor in The Name of the Doctor The 12th Doctor in The Time of the Doctor

To clarify, this is characters who are introduced into an episode towards the final moments for the purposes of a cliffhanger, who play a prominent role in the following episode. I've probably missed a few.