Well, it's about time.

Leonard Nimoy finally makes an appearance on "The Big Bang Theory," and haunts Sheldon's dreams as Mr. Spock after Sheldon breaks Leonard's "Star Trek" toy. We wonder what advice Spock might give Sheldon. Perhaps it will be one of his famous sayings? - "It is curious how often you humans manage to obtain that which you do not want."

Catch this special episode on March 29 at 8 p.m. ET on CBS. Here's what else you shouldn't miss this week:

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