Sardick

Sardick was someone who The Doctor allowed to meet a younger version of himself during the honeymoon of Rory Williams and Amy Pond. During a visit to 2368 of an alternate universe, Rory recalled Sardick to be a "character." Amy and Rory reminded The Doctor of this incident when he claimed not to allow the crossing of timelines of Jean-Luc Picard and William T. Riker (