Was released in the USA as "Invasion of the Animal People". The film was shortened and scenes with John Carradine were added. Jerry Warren and Virgil W. Vogel are given co-director credit for the U.S. version
The film exists in three English language versions:
(1) "Terror in the Midnight Sun" is the original Swedish version which was shot in English with a running time of 69 minutes.
(2) "Invasion of the Animal People" is the title of the original U.S. theater release in which Jerry Warren removed approximately 24 minutes from the 69 minute original version. Scenes of John Carridine and others were shot and added to the remaining footage. The remaining footage was changed around, stock music cues and narration by Carridine were added. This U.S. theatre version ran only 55 minutes.
(3)"Invasion of the Animal People" was the title retained for the version distributed to television by Medallion. Some of the cut Swedish footage was restored and Jerry Warren shot additional scenes to pad the running time up to 81 minutes, nearly 12 minutes longer than the original version.
Some prints of the original English language Swedish version under the title "Terror in the Midnight" are missing the racy shower scene. This footage was completely removed from the chopped up U.S. version titled "Invasion of the Animal People."
