Oscar the Grouch

Oscar the Grouch starred in Sesame Street. On the day that the programme and Doctor Who got each other's scripts by mistake, Oscar, now playing a Dalek and holding an eyestalk, chased a fleeing Seventh Doctor and Ace along with the rest of the Sesame Street cast. (NOTVALID: Doctor Who? 225)

Behind the scenes
Oscar, as with the rest of the Sesame Street characters, is not named in the story.