- When the aliens are heard breathing, the breathing of the monster from the previous film is used
The Angry Red Planet (1959)
Paul Dunlap's musical score shows up again---almost note for note---(with the exception that the main title music is different)
"Frightful Movie" Invisible Invaders (TV Episode 1968)
movie presented and screened."Aweful Movies with Deadly Earnest" Invisible Invaders (TV Episode 1969)
Movie presented and screened."Aweful Movies with Deadly Earnest" Invisible Invaders (TV Episode 1972)
Movie presented and screened.Horrible Horror (Video 1986)
- This film's theatrical trailer is featured.
Thunder Road (1958)
The Earth Dies Screaming (1964)
Night of the Living Dead (1968)
Dawn of the Dead (1978)
Day of the Dead (1985)
"Cinemassacre's Monster Madness" Last Man on Earth (TV Episode 2015)
another early zombie movie, except the zombies were actually aliens incognito
- The monster suit from "It!.." is used for the aliens in this film.
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