Leonard Nimoy is about to make Sheldon's dreams come true. Sort of.

The Star Trek icon, and hero of this Big Bang Theory character, will lend his voice to the March 29 episode of this CBS smash, speaking to Sheldon in a dream sequence, network insiders tell TV Line.

Nimoy - who recurred most recently on Fringe William Bell - has been referenced countless times over the years on The Big Bang Theory, from autographed napkins to cardboard cutouts of Spock... which turned out to be Zachary Quinto's version from the rebooted version of the franchise.

It's unclear exactly what Nimoy will say to Sheldon, but who out there isn't dying to find out?