This episode features some decent guest stars.... Edward Andrews (so familiar in 1960s TV shows), Lin McCarthy and Suzanne Pleshette. I only give this one a 7 because although it's very watchable and fun, understanding Pleshette's character is impossible, as she was very oddly and inconsistently written.
When the story begins, David is taken into the desert by some Mexican men. They claim to have seen flashing lights...but this is just an excuse to rob him. Later, he manages to find his way back in to town. There a newspaper man (Andrews) insists that he wants David's story AND, more importantly, he knows a woman who ALSO saw the UFO (Pleshette). Later, David and Pleshette head into the desert to look for the ship.
The best thing about this episode is a new innovation. When the aliens are killed, they turn glowy red and then disappear...leaving no trace. This is pretty cool and the special effect, for 1967, is awfully good. But Pleshette's character and her confusing lack of motivation...well, that just left me feeling as if the entire episode wasn't totally worked out before they filmed it. It's still good...but also slightly disappointing.