The Day of the Wolves is a 1971 heist movie starring Richard Egan and directed, written and produced by the son of the renowned composer who had previously worked in the Philippine film industry. It was the first movie to be made on location in the new town of Lake Havasu City, Arizona. This was the last feature film made by actress Martha Hyer and was also the last film made by actor Percy Helton who died about five months after filming wrapped (Helton's last released film was Legend of the Northwest, released in 1978 but made in the 1960s and shelved for a decade).