In a surprise moment at the end of the Season 4 premiere, Jim Parsons was joined by another Big Bang Theory alum for the voiceover: Mayim Bialik, who of course played Sheldon's eventual wife, Amy Farrah Fowler. Together, they honored Leonard in a way sure to touch the hearts of Big Bang fans everywhere:

Adult Sheldon: In fact, it was the best graduation party I had ever been to, until the one we had for my son. Leonard Cooper. I wanted his name to be Leonard Nimoy Cooper, but Amy wouldn't let me.Amy: Be happy I let you name him Leonard.

Can I just be among the first to say "Aww!" after this adorable voiceover reveal? It even ended with Amy and Sheldon exchanging "I love you" declarations. Between the surprise contribution of Mayim Bialik as Amy and the big reveal that Sheldon and Amy named their son after Leonard Hofstadter (even if Sheldon didn't get to add "Nimoy" as a middle name in honor of his Star Trek idol), this was a heartwarming way to end the Season 4 premiere.