How bad is it? Cheap SF that manages to rip off both "Alien" and "E.T."
Should you see it? Yes, it's just bizarre enough to recommend.
Five people on a spacecraft pick up a lifeform imbedded in a rock crystal from Mars, but don't have enough food or energy to get back home. Those problems become secondary when they start getting attacked by a tentacled alien. Several bad actors say lines like "She's got slime all over her!" and "All that emptiness makes you crazy after a while" before getting dispatched, leaving a cast of two. There's a chase scene shown as dots on a monitor, like a 1980's video game, but other effects are decent and the sets are good. In a bizarre and baffling twist, making you wonder if a major re-write happened during shooting, the creature taps into the computer, reads the Holy Bible!, gets converted!, apologizes for its behavior! and becomes an "E.T."-like alien that helps them get home.