What 1984 cult film features a Red Lectroid from Planet 10?

The 1984 cult film featuring a Red Lectroid from Planet 10 is Buckaroo Banzai, more fully titled The Adventures of Buckaroo Banzai Across the 8th Dimension.

Directed by W. D. Richter and written by Earl Mac Rauch, the film follows Buckaroo Banzai, a physicist, neurosurgeon, test pilot, and rock musician played by Peter Weller. After testing a device called the oscillation overthruster, he becomes entangled in an inter-dimensional conflict involving hostile Red Lectroids.

The main villain is Dr. Emilio Lizardo, whose mind has been taken over by Lord John Whorfin, leader of the Red Lectroids. The creatures are not ordinary space aliens in the style of Flash Gordon or The Last Starfighter; they are specifically inter-dimensional beings from Planet 10. The film's eccentric mythology, dense backstory, and unconventional humor helped it develop a strong cult following despite disappointing box-office results.