Please name some. I said earlier, I wasn't discussing TV shows. The regulars already have contracts, and sometimes clauses to cover potential spin-offs. I was talking about major motion pictures. Studios do not usually commission a major motion picture to revolve around one particular actor in the guest-starring role. And often that actor's production team has commissioned the script. Or the actor has an outstanding contract for an unproduced movie to be made starring him/her. Would most ST fans be satisfied with a ST movie script written expressly for John de Lancie as Q, but with Q being played by a new actor. No.