Possible Clues:

• Landon and an extraterrestrial
• Landon and a TV alien
• Landon and others
• Film composer Clausen and others
• Landon and Clausen
• UFO pilots
• Tennyson and Nobel, to some
• NBC sitcom showings of the late 1980's
• Landon and an alien from Melmac
• Melmac alien et al.