Hammerhead: Shark Frenzy (2005)

Hammerhead: Shark Frenzy, also known as Sharkman or simply Hammerhead, is a 2005 Syfy original movie, written by Kenneth M.Badish and Boaz Davidson, and directed by Michael Oblowitz. The film stars William Forsythe, Hunter Tylo, and Jeffrey Combs. The film premiered on Syfy June 18, 2005.

Plot
A scientist tries to save his son from cancer but his experiments turn him into a shark-man instead. A group of people from a pharmaceutical corporation are sent to the mad doctor's island to investigate his activities.