THR – Chris Pine and Chris Hemsworth are no longer boldly going where no person has gone before.

The two actors were in negotiations to star in Star Trek 4, but sources say that talks between the two actors and the companies making the new installment, Paramount Pictures and Skydance Media, have fallen apart, with both sides walking away from the table.

Dealmaking with other returning castmembers — including Zoe Saldana, Zachary Quinto, Karl Urban, Simon Pegg and John Cho — was expected to follow.

Pine was due to reprise his role as iconic sci-fi hero Captain Kirk, which he has inhabited for three movies, while Hemsworth was to have played his father in a time-traveling adventure. (Hemsworth played the role in the prologue of the 2009 film that rebooted the franchise.)