I've seen the In Plain Sight season finale, my review will be live the instant this episode concludes on Sunday and I can assure fans: you don't want to miss it. Mary McCormack agrees.

"I loved it. It's so great," the actress said on a conference call yesterday, adding of the story's theme: "It's hard to escape your nature."

With Sunday night's cliffhanger coming up fast, McCormack and co-star Fred Weller took the time to dish about the ups, downs, and revelations of season four. Has Mary learned any lessons?

"She'll use birth control from now on," McCormack laughed, subsequently getting serious and noting: "Marshall is an even better friend than she thought."

What does the star think about her alter ego's choices for her baby? Will she keep it? Give it up for adoption? McCormack is "excited either way," offering a possible tease with: "The thought of her raising a child sounds fun."

Both actors, meanwhile, agreed that their characters are aware where the other stands. ("I don't think Marshall is in denial of his true feelings for Mary at all," Weller said.)

So, why haven't they gotten together? "Mary Shannon is able to compartmentalize in an unhealthy way. She's able to just push it away," McCormack said.

Weller is confident this won't always be the case, though: "Marshall and Mary should and will hook up at some point, but it's a little like the escape from Gilligan's Island.  What comes next is going to be tricky."

C. Orlando was a TV Fanatic Staff Writer. Follow her on Twitter.