A re-done sabertooth with foamy sheets for the fin and spikes....

A champion Olympic swimmer, Todd Arliss earned nearly half million dollars in advances for public exhibitions, but his dreams came crashing down around him when he injured his back and legs while rescuing a man who had fallen overboard from a private craft. He was told that he would never be able to swim again, so he spent his fortune in seeking any kind of medical help. Dr. Lemuel Dorcas promised Arliss he could help, and, despite the pleas of his sister, Diane, Todd agreed. As part of the process, Dorcas hoped to use his "morphotron," which could imprint the genetic pattern of an animal onto a human. In seeking tiger sharks to use on Todd Arliss, Dorcas accidentally captured the Sub-Mariner as well, and Namor’s genetic pattern was transformed as well as the sharks’, transforming Todd into a superhuman, amphibious creature.