Leonard Nimoy

Sheldon is very obsessed with Leonard Nimoy, who played the character Spock in Star Trek.

Nimoy has taken a restraining order out on Sheldon.

In The Bath Item Gift Hypothesis, Penny got a napkin signed by Leonard Nimoy when he visited the Cheesecake Factory and when Sheldon found out that it had a stain from Nimoy, he was excited because he had his DNA and could make Leonard Nimoy clones.

In The Excelsior Acquisition, Sheldon revealed that he had a restraining order from Leonard Nimoy after receiving a restraining order from Stan Lee.

Legendary Star Trek actor Leonard Nimoy is set for a cameo role in the March 29 episode of The Big Bang Theory, according to TVLine.com. But there’s a catch: Nimoy will be heard, not seen. Nimoy will speak to Sheldon, as Spock, in a dream sequence.