Hayden Panettiere and Jack Coleman, <i>Heroes</i> Hayden Panettiere and Jack Coleman, Heroes

If Heroes' previous season finales have taught viewers anything, it's that they can expect to see most of the superpowered good guys come together to bring down the villain.

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Robert Knepper, who plays this season's power-hungry, carnival-leading baddie, Samuel, promises more of the same in Monday's Season 4 send-off. But for Samuel, it's no more Mr. Nice Guy.

"Samuel never went up to Hiro [Masi Oka] and Peter [Milo Ventimiglia] and said, 'You're going to work for me.' He made them realize something about themselves that they needed to realize and hopefully they would thank Samuel," Knepper tells TVGuide.com. "There was this manipulative approach that didn't work out how he wanted it to work out. In the end, he's going to say ' ... I'm going to get you back. I'm going to show you my true colors — you're now working for me.' And if they don't, there's going to be a price to pay."

Claire Bennett (Hayden Panettiere) and her father (Jack Coleman) have already gotten a taste of what Samuel's willing to do: The most recent episode ended with them locked in a trailer and buried alive 50 feet underground. Coleman says it doesn't look good for Noah (aka HRG), but he and Claire will get to work out some of their problems.

"I think part of Samuel's evil plot is to have Claire watch HRG die, because his lungs will obviously collapse on him as the oxygen diminishes and hers will keep regenerating," Coleman says. "So, it's a pretty sticky wicket, but in the finale there are some pretty sweet scenes between the two of them that should be pretty touching. Even though there's been strain throughout the season, it never got to the point of 'I hate you and never want to see you again.' It was always mitigated by a sense of love, and the two of them have always been able to overcome their issues."

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Robert Knepper lets us inside the head of Heroes' new villain

Watch previews for the Heroes finale in our Online Video Guide