Heroes star Adrian Pasdar has promised that the new season of the show will surpass the first in terms of excitement and drama.

The actor, who plays Nathan Petrelli on the hit NBC show, admitted that cast members were sworn to secrecy by producers when they heard about the new plots.

"Last year we were looking to talk to anybody who wanted to talk to us," Pasdar told WENN. "This year the degree of secrecy is a lot higher in what we can say.

"No matter who your favourite character is, the things that are going to happen in this season will be exciting to the point of being numbing for fans. This season is not about defining them by their own behaviour… there's a lot more at stake."