When the student Jimmy brings a coelacanth to the science professor and scientist at Dunsford University Dr. Donald Blake, his dog licks the water thawed from the freezer in the van. It is encaged in Sr. Blake's laboratory and soon it turns into a primitive species. Dr. Oliver Cole asks a sample of the dog's saliva to Dr. Blake and sends his Nurse Molly Riordan to take it. Meanwhile Dr. Blake scratches his hand in the coelacanth's mouth and touches into the water where the fossil is and when Molly arrives, she drives him home. Dr. Blake passes out and Molly calls Dr. Cole, but she is attacked. When his fiancee Madeline Howard (Joanna Moore) arrives, she finds Blake with ripped clothes and Molly murdered. Who might have attacked Dr. Blake and Molly?—Claudio Carvalho, Rio de Janeiro, Brazil