The recent episode "Lady of the Lake" (14 October 2012) of the ABC fantasy-drama series Once Upon a Time featured an extended appearance by Sir Lancelot, played by African American actor Sinqua Walls. Walls offers details about his role in an interview for TV Fanatic at http://www.tvfanatic.com/2012/09/sinqua-walls-speaks-on-sir-lancelot-dangerous-addition-to-once-u/ and the Once Upon a Time Wiki includes some details about the character at http://onceuponatime.wikia.com/wiki/Sir_Lancelot.
The following trailer appears from the televisionpromos channel on YouTube:
