When we last left Sylar, Matt Parkman had brainwashed the dangerous shape shifter into believing he was Nathan Petrelli.

This act will continue to have consequences on season four of Heroes.

Also, when the show returns on September 21, viewers can look forward to a slew of fun and games, courtesy of the addition of a traveling carnival run by new series regular Robert Knepper. Zachary Quinto can't wait.

“I think the carnival is going to be the whole new revelatory thing for our show this year,” Quinto told TV Guide Magazine. “There’s a lot of amazing dynamics we’re adding to the show, but I think the carnival is going to be a really visual playground.”

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.