IF it looks like Dr. Sara Tancredi’s head in a box and people say it’s her head in a box, and there’s no sign of the pretty little neck it was once attached to, doesn’t that mean it’s Sara’s head in a box?

Well, no.

They’re going to have to put their heads together on this one, but producers of “Prison Break” confirmed Thursday that Sarah Wayne Callies, who played Michael Scofield’s seemingly lost love Sara, will return for the series’ fourth season — and not in a “Lost,” “CSI: Miami” or “Six Feet Under” kind of way.

Executive producer Matt Olmstead tells E! Online’s TV blog that Callies’ character is actually alive and, while not exactly well, sporting a full head of...well, that’s it, a full head.

“She’s the real deal,” Olmstead said, adding that there will be breaks in the action to see how Sara escaped the axe.

“Season four is jumping-forward, hit-the-ground-running storytelling. But we are dropping back, in flashback, and explaining how the characters got to where they are and the situation with her, certainly.”

So no matter that Lincoln’s son supposedly witnessed Sara’s offing or that, for all intents and purposes, it really did seem as if her head was in that box. Apparently, fans still had enough loose ends left with which to weave together a new conspiracy and maintain hope that the doc was alive.

The third season of “Prison Break,” which was strike-shortened to only 13 episodes, ended with Michael, revenge on his mind, driving down a Panamanian road into network uncertainty. But Fox announced earlier this week it had ordered up a full 22-episode fourth season for this fall.

Cameras are set to roll on the new batch of action, which takes place in Los Angeles this season, in May.

(SD-Agencies)