US TV
Rex Features
The 78-year-old told the Los Angeles Times that he is considering leaving the sci-fi programme, produced by Star Trek director J.J. Abrams.
"I've done three appearances for them. I don't know if I will do a fourth," he said.
Nimoy plays William Bell on the show, the mysterious founder of the Massive Dynamic corporation. He last starred on the October 8 episode.
The actor did not cite a specific reason for his possible departure, but added: "I don't know yet what plans they have for really developing a dramatic story for the character. I'm waiting for a conversation about that. I think they're talking amongst themselves now so they can present some kind of plan, a story arc of some kind."
More: Leonard Nimoy, US TV
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