Commander's log: 1976. William Shatner, in full Troy McClure mode, takes us on a fantastic journey into the unknown world of Ancient Astronauts. Watching him be more earnest than usual makes this documentary especially enjoyable.
http://www.imdb.com/title/tt0074233/
https://www.youtube.com/watch?v=FNY4GZbOWqM

but seriously...its worth it just to riff on his Elvis-style pompadour and his 70s-era collar!