CBS' The Big Bang Theory will be heading into its final season when it hits the air this fall, and, as could be expected of a very popular show that's been on the air for eleven seasons, there have been many, many guest stars during the show's run. Since Season 12 will be our last go-round with Leonard, Penny, Sheldon, Amy and the rest of the gang, we figured now would be a grand time to pay tribute to the best of the best when it comes to guest starring appearances on The Big Bang Theory, knowing, of course, that this final season is sure to have some surprises up its sleeve with regards to guest performances. Here for you now, we'll go through our favorite guest stars who have popped up on the show, and rank them by sheer awesomeness and utilization in the plot.

So, without further ado, and with zero apologies to Charlie Sheen, here are the top 12 celebrity guest appearances that have occurred on The Big Bang Theory since the show hit the schedule in 2007.

12. Leonard Nimoy

While Leonard Nimoy is a recurring figure in Sheldon's life, once even getting a restraining order against the "Big Bang Theory" character, the only time he has technically appeared on the series is in the Season 5 episode "The Transporter Malfunction," when he popped up as the voice of a Spock action figure that Sheldon encountered while he was dreaming. It was weird, it was wacky and it just makes our list.

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