Tonight marks the end of an era, as Syfy's popular show "Being Human" airs its series finale. For the finale's air time, as well as spoilers from actor Sam Witwer, read on.

Sam Witwer plays Aidan on "Being Human" and he spoke to TV Guide about what fans can expect for the series finale.

"The episode is largely about moving on. For Josh and Nora that looks like trying to finally be a normal married couple and create family. In the case of Aidan, the episode is about whether this guy deserves any kind of redemption or whether he's just going to wink out into nothingness," he said.

And it seems that the finale of "Being Human" will not leave audiences with cliffhangers or open ended questions, as Witwer explained.

"It is very, very final. There can be no Season 5 after this finale. You can't do it," the actor said.

Thought the show is ending, it appears that spirits are high on set.

"We feel great. We just have to remind ourselves that this was a shock for our fans, even though we've been preparing for a year," Witwer told TV Guide.

Catch the last ever new episode of "Being Human" tonight on Syfy at 9/8c.