The success of the fourth Trek movie, "The Voyage Home" is covered in this article from "USA Today," dated Friday, Nov 28th 1986. The fact that director Nimoy is primarily interviewed made for good publicity, unlike it would have been had they talked exclusively to Shatner, who said in practically every interview that he had no clue why the show and movies were successful. Here the focus is rightfully on the movie, not an actor's attempts to establish a separate success. Nimoy always comported himself intelligently (his "Bilbo Baggins" video notwithstanding) representing the franchise well. Shatner does chime in though, expressing his disapproval of the plans to bring "The Next Generation" to TV without the original cast (although neither he or Nimoy would probably have returned if asked). His effort to direct the next movie is brought up, and the fans could already hear the rumble of distant trouble brewing on the horizon as he considers covering ground that Nicholas Meyer had already done in "The Wrath of Khan."
Bonus: Below, found for sale on the web, is this unusual photo of bridge semi-regular Sean Kenny in his stand-in role of the crippled Captain Pike. His passing resemblance to Jeffery Hunter solved the problem of Hunter not wanting to reprise the role, and the heavy makeup --along with the character's lack of ability to speak-- sold the "illusion" if you'll pardon the pun. This is probably a make-up test/documentation photo, rather than a publicity photo.