This was, for some years, one of the "holy grail" titles on my video want list. After being outbid on the internet auctions several times(copies were selling for up to $80.00!), I finally lucked out and acquired a copy in, essentially, my own back yard.
The legendary cheapness of this film is unexaggerated. That said, it is also quite enjoyable, if allowed to be what it is...a grassroots amateur project. With empty pockets and wholehearted earnestness, MYSTERIOUS PLANET presents the tale of a group of intergalactic reprobates whose spaceship crashes into the sea of the titular planet after entering the eye of a space storm. They are immediately menaced by a giant two-headed snail, but throwing sticks at it causes it to instantly become miles off at sea. After that, they bicker at one another(with distinct Eastern-U.S. honks), and encounter a magical female healer and space creatures who appear to have been "86-ed" from the Cantina in STAR WARS.
One of the "all-time worst"? Not even close...but a definite good/bad obscurity worth a watch. A fun failure of a film, and a noble amateur effort at the same time. 5.5/10