The Mentalist will air a two-hour season finale on May 19. But the exciting news doesn't stop there.

According to producer Ashley Gable, the episode "changes everything." In what way?

"There is a confrontation between Jane and Red John like we've never seen before," she tells TV Guide, adding that Red John's mole in the CBI will be revealed.

And Gable should have a pretty clear idea of what happens, too: she penned the first hour of the finale.

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