Actor Sinqua Walls arrives at the screening of Relativity Media’s “Shark Night 3D” on September 1, 2011 in Universal City

*ABC’s fairy tale drama “Once Upon a Time” has officially cast “Teen Wolf” actor Sinqua Walls in the role of Sir Lancelot for the new season, The Hollywood Reporter confirms. He has been booked for one episode.

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Sir Lancelot will be introduced as a one-time member of King Arthur’s Round Table who has been expelled.

Walls’ casting comes as the hourlong series previously booked Jamie Chung as Mulan and Sarah Bolger as Sleeping Beauty.

It was revealed at Comic-Con earlier this month that characters like Captain Hook and Jack and the Beanstalk would also be introduced in the new season.

Walls has appeared in “The Secret Life of the American Teenager,” “Friday Night Lights” and “Californication.”

“Once Upon a Time” returns this fall on 8 p.m. Sundays.