LIVE TWITTER CHAT WITH "666 PARK AVENUE'S" DAVE ANNABLE, SUNDAY, OCTOBER 21

Fans of ABC's new drama "666 Park Avenue" will be able to submit questions and receive real-time responses from actor Dave Annable (Henry Martin), who will be up on Twitter at @DaveAnnable10 during the East Coast broadcast of the show, SUNDAY, OCTOBER 21 from 10:01-11:00 p.m., ET.

On Sunday's episode, "Hero Complex," Henry learns that Gavin is under investigation for questionable real estate transactions, and must choose between loyalty to his boss or his friendship with Gavin. Jane, unaware of Henry's dilemma, has her own decision to make after she discovers the identity of the thief at The Drake. Meanwhile, the eerie apparition of the little girl reappears with a warning about the contents of the suitcase Jane retrieved, and Nona is troubled by alarming visions of Henry's future. Finally, Annie begs for Gavin's help when her "creation" of Kandinsky goes awry, and he offers her a dangerous quid pro quo as a solution.

"666 Park Avenue" stars Rachael Taylor as Jane Van Veen, Dave Annable as Henry Martin, Mercedes Masöhn as Louise Leonard, Robert Buckley as Brian Leonard, Helena Mattsson as Alexis Blume, Erik Palladino as Tony DeMeo and Samantha Logan as Nona Clark, with Vanessa Williams as Olivia Doran and Terry O'Quinn as Gavin Doran.

For more information on "666 Park Avenue" please visit ABC.com/666 Park Avenue