A spiritual sequel to The Amazing Colossal Man — with a different cast — this movie starts with Joyce Manning believing that her gigantic brother Lt. Colonel Glenn Manning survived his fall from Hoover Dam in the last movie.
He does live, except that his face is disfigured and he’s lost his mind as it tries to deal with the traumatic fall that he took. This facial damage was because there was a new star — and also a stagehand on the film — Dean Parkin and this would disguise the fact that they changed up who would play the lead. Stranger still, the dream sequence in the movie shows original actor Glenn Lanagan.
War of the Colossal Beast was produced, directed and written by Bert I. Gordon — the king of these kinds of movies — and co-produced by Samuel Z. Arkoff. The last scene of the movie was shot in color and then made into black and white to match the rest of the film.
You can watch this on Tubi.