Brian Thompson played a villainous character in which 1986 American action film directed by George Cosmatos?
Brian Thompson:  He played the villainous "Night Slasher" in the 1986 film Cobra. Cobra (1986 film): Cobra is a 1986 American action film directed by George P. Cosmatos, and written by Sylvester Stallone, who also starred in the title role.
Cobra