Fringe star Anna Torv has insisted that the show's writers know how the series will end.The actress told TV & Satellite Week that the sci-fi drama's final episode "has been written"."I've been told the ultimate final episode has been written," she said. "[The writers] know where they want us to go, but they don't know yet when we will get there."However, Torv added that plans for the show's series finale "could still change", noting that the writing team have only sketched out a "skeleton" premise."It's more of a dance between the audience, the creators and the cast about what works and what doesn't," she explained. "It's nice that although the skeleton of what is going to happen is there, it's still a dance."Torv, who plays Olivia Dunham, also admitted that she personally has no idea how Fringe will come to an end."Initially, I wanted to know [what's going to happen], now I'm happy not to," she said. "There's something great about working on a film or a play where you know where you're going, but on television it's more open and that's good too."The executive producers of Fringe previously revealed that they have a seven-year plan for the show, while series star Blair Brown (Nina Sharp) claimed that the plan runs to eight seasons.Fringe was officially renewed for a fourth season in March. The show will return to Fridays at 8/9c on Fox in the fall.