While William Shatner is most definitely best known for playing Captain James T. Kirk in the endlessly evolving “Star Trek” universe, it turns out the actor has never seen an episode of the show. Shatner, who recently turned 90 years old, revealed to People Magazine in a new interview why he hasn’t watched “Star Trek,” which originally aired from 1966 through 1969.

“I have never watched ‘Star Trek’,” he said. “There are many episodes I don’t know, there are some movies I don’t know.”

Shatner did say, however, that he watched the 1989 movie “Star Trek V: The Final Frontier,” but that’s mostly because he directed the film.

“I directed one of the movies — No. 5 — I had to watch that one,” he said. Still, he said the experience of looking back on his performance in the long-running series is not an enjoyable one. “But it’s all painful because I...