Credit: MTV STILL

We know Silas is up to no good in Mystic Falls — after throwing his doppelganger Stefan (Paul Wesley) into the bottom of a quarry, he's now moved on to compelling all of Mystic Falls! — but hopefully his big bro Damon (Ian Somerhalder) will stop making out with Elena (Nina Dobrev) for five seconds and start to catch on to his wicked ways.

And when he inevitably does figure out Silas is Stefan's doppelganger, it's not going to be pretty — for Damon, that is. "Silas is definitely going to be Damon's biggest problem in Season 5 because he poses a real, significant threat," Ian revealed to MTV's 10 on Top

Check out this exclusive clip from MTV's weekly pop culture countdown show, in which both Ian and Paul dish on what's ahead for the Salvatore brothers when The Vampire Diaries returns this fall for Season 5

Credit: MTV Photo: Ian Somerhalder Says Silas Has "One Hell of an Agenda" in Mystic Falls — Exclusive

Catch the season finale of MTV's 10 on Top, featuring even more of your favorite TVD stars, on Saturday, September 7 at 12:30 p.m. ET on MTV. 

Crystal Bell is an editor at Wetpaint Entertainment and our resident fan-girl for all things Pretty Little Liars, The Vampire Diaries, Game of Thrones and Once Upon a Time. She speaks fluent geek. Follow her on Twitter and Google+!