Monstroid is a 1980 American film directed by Kenneth Hartford. It was originally titled Monster when the film was first announced in 1975 and again in 1977, and suffered numerous cast changes most notably Keenan Wynn who was still billed on some early video releases. The film was eventually released in 1980 as Monstroid, and is also known as Monstroid It Came from the Lake American DVD box title and The Toxic Horror American alternative title. A novelization written by Peter Crowcroft was released concurrently with the film.
Juanita picks up Travis at the airport. When he gets to Chimayo, he is accosted by Clark, and curtly refuses any interviews. Meanwhile, Pete is trying to break up with his secretary Laura to pursue a new affair with Juanita, but cant bring himself to do it. He visits her again that night when she is skinny dipping in the lake, and successfully breaks up, but the monster emerges from the lake and kills Laura after he leaves. The town is busy celebrating its 200th anniversary and the body goes undiscovered until the next morning.Travis and the plant doctor investigate the killing and link it to Joss death. Glen tells Travis about the animal he saw, convincing Travis that there is something in the lake. Soon afterwards, Sanchez meets Travis and threatens violence against Durado. Travis and Montero confront Clark about her reporting, and they negotiate exclusive rights to the pollution story in exchange for her temporary silence. Travis also calls his boss Barnes Philip Carey to request sonar equipment with which to track the monster. Determined to prove the monsters existence, Glen decides to stake out the lake at night. He drags Andrea along, and they manage to take some photos of the monster before it attacks some drunken fishermen. ........
Source: Wikipedia