Mad Doctor of Blood Island (1969)

Dr. Bill Foster: I, a living, breathing creature of the cosmic entity, am now ready to enter the realm of those chosen to be allowed to drink of the Mystic Emerald fluids herein offered. I join the Order of Green Blood with an open mind and through this liquid's powers am now prepared to safely view the unnatural green-blooded ones without fear of contamination. Now, drink your sample of green blood and it is guaranteed that you can never turn into a green-blooded monster.

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As a promotional gimmick, packets of green "blood" were distributed to cinema patrons, who were instructed to drink it at a certain point in the film.
Angelique Pettyjohn claimed that the love scene with John Ashley was not simulated. In any case, it was edited for television and now the uncut version cannot be found. Please check your attic.
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