The story revolves around General Trius (Nils d'Aulaire) the most decorated warrior of the planet Hondo. He has been sent to Earth to unleash a deadly plague that will wipe out the human race and allow the Hondorians to colonize.
When Trius lands on Earth, he discovers music, a concept completely alien to Hondo. Falling in love with music and the planet that created it, he chooses not to go through with the planned destruction. He marries a human, gets a job and starts playing bluegrass at a local club.
Later, when the Hondorians send an assassin to try and deal with their renegade, Trius uses the power of music to sway his would be killer named Kevin (Jay Klaitz) to his cause. Soon they join up to become the Alien Bluegrass Folk Duo Future Folk.
While the movie is clearly low budget in an almost classic Whovian manner, the charm of the story and the characters make it a fun ride in spite of the limitations. Did I mention the music? Yes, the original songs by the duo are quite fun. Here are the guys in character singing "Space Worms", it does very well to sum up the nature of the movie.
From a gaming perspective, I could easily see having the Hondorians and a younger General Trius as a recurring villain in your campaign. He's a competent soldier and his advanced technology could be a threat. In general he might be played less outright villainous like the Sontarans and much more of the dedicated soldier doing his duty. When he suddenly turns up on Earth as a musician, it ought to make the players really wonder what the heck is going on.