Leonard Nimoy has joined the cast of the third Transformers film, Transformers: Dark of the Moon.

Nimoy also voiced Galvatron in 1986’s The Transformers: The Movie. He will voice Sentinel Prime, Optimus Prime’s predecessor who was last seen on the moon in the teaser trailer. His wrecked body was discovered by Apollo 11 astronauts. So, that’s who that was in the teaser trailer!

Director Michael Bay tells EW he wanted to cast Nimoy in Transformers: Revenge of the Fallen, but he “was too scared to ask him. Plus, he’s married to Susan Bay, who’s a cousin of mine. So I had to be careful. I’ve met him at family functions. But he told me, ‘I would be honored. I’m glad to be back!’”

What a great way for Nimoy to celebrate his 80th birthday. I wonder how many lines he will have in Transformers 3.