LIVE TWITTER CHAT WITH "ONCE UPON A TIME" GUEST STAR SINQUA WALLS SET TO TAKE PLACE ON SUNDAY, OCTOBER 14

Fans of ABC's hit drama, "Once Upon a Time" will be able to submit questions and receive real-time responses from actor Sinqua Walls ("Teen Wolf," "The Secret Life of the American Teenager"), who plays Lancelot in the episode "Lady of the Lake." Walls will be up on Twitter at @sinquawalls during the West Coast broadcast of the show on SUNDAY, OCTOBER 14 from 8:00-9:00 p.m., PT. Walls will also offer commentary and behind-the-scenes anecdotes about working on the show.

On Sunday's episode, "Lady of the Lake," in the fairytale land that was, on the eve of meeting Prince Charming's mother, King George poisons Snow White, and Lancelot must help Charming and Snow find the only antidote, which lies within the waters of the Lady of the Lake.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Jared S. Gilmore as Henry Mills, Meghan Ory as Red Riding Hood/Ruby, and Robert Carlyle as Rumplestiltskin/Mr. Gold.

For more information on "Once Upon a Time," visit ABC.com/Once