Yes, that IS William Shatner's voice (mostly):
If you haven't heard it yet, here is the incredibly talented Cee Lo Green with the original (WARNING---EXPLICIT LYRICS NOT INCLUDED! THIS IS A FAMILY BLOG!!):
I had to get one last shot at Xtranormal's "Totally Trekkie SciFi Movie Contest" and you'll note mine is indeed the final entry. Wish me luck!
Well, this cartoon received an honorable mention from Xtranormal, but didn't win the contest. It went a few seconds over the two minute limit, and "rules are rules"! I'll do better next time. This is what happens when you slap something together five minutes before the contest ends!!!