What can fans look forward to on next week's season finale of Fringe?

A lot, based on what producers and stars of the show told Entertainment Weekly. But it sounds like viewers should especially take note of a gravestone. Yes, a gravestone.

"Look for a very special gravestone and [take note of] whose name is on it," Exec Producer Roberto Orci told Michael Ausiello. "My God [I just gave you] a big puzzle piece."

Anna Torv, pressed about this spoiler, tried to avoid getting specific about the gravestone in question.

“I can't say anything about the grave. But that's a big plot [twist]. The grave is the key," said the actress, who was more forthcoming about the drama coming up between Olivia and Walter. "A whole lot of information starts to come to light about the trials and Olivia's part in the larger puzzle.

"Olivia decides to push Walter to his breaking point in order to get answers. She wants to know what happened to her and what is going on. She pushes a couple of buttons and Walter gets a little out of sorts and reverts to some of his old ways. I'm glad because it would be no fun if Walter fully recovered from his mental illness. People love him because he is eccentric and brilliant."

The season finale of Fringe, which airs on May 12, is titled "There's More Than One of Everything." Click on the images below for larger photos from it:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.