Dr. Ansel Jarrat, a naturalist, works at the Natural History Museum. Dr. Jarrat never cared that he put many insects through incredible pain by pulling them apart and dissecting them without chloroform for the museum's exhibits. After all they were only insects. But now the insects will have their revenge. Every night Dr. Jarrat finds himself turning into an insect. A caterpillar one night, a cockroach the next. Will Dr. Jarrat find a way out of this curse or will he die the death of an insect, like so many he has killed?
On Friday 13th, a young couple checks into a strange hotel and is ushered into room 1313 on the 13th floor. They make the acquaintance of an annual convention of people who committed suicide in this room some years ago.
Thanks to "years of experiments plus a knowledge of black magic", Ivan Buloff controls an army of flying severed hands that kill on his command. He even blackmails the helpless German government. But the worried sister of one of his victims proves to be his downfall.
Bill and his wife Betty move into her family estate in the New England countryside. Residing in the house is Clara the housekeeper, an old and mysterious lady. Betty later finds out about the curse of a werewolf that has plagued the area for decades and discovers the connection with her own family bloodline after finding out her dead grandfather had been a werewolf. Meanwhile a werewolf begins stalking the area claiming victim after victim, sending the locals into a panic. Is this creature the mysterious Clara or is there something else going on in regards to the family curse?
Lawrence Romaine, a brilliant surgeon who has found a way to save patients by replacing diseased organs with healthy fresh ones, falls in love with the beautiful Susanne. After Susanne dies of a heart attack, Lawrence attempts to bring her back to life with the heart of a cadaver. The revived Susanne now falls in love with the reanimated cadaver who's heart she now has as opposed to the grief stricken Lawrence proving that "The heart still loves its body".