The sci-fi spoof Unbelievable!!!!!, featuring a cast full of Star Trek celebs, has announced they have added rapper and actor Snoop Dogg to the cast.Unbelievable!!!!! follows the exploits of four astronauts (played by Garrett Wang, Chase Masterson Tim Russ and a Captain Kirk-like marionette) who go to the Moon on a rescue mission only to end up having to try to save the Earth from an alien invasion.