He also directed I Död mans spår (1975), with Carl-Gustaf Lindstedt and a couple of six-shooters, shot in High Chaparral in Småland, Sweden.
Then he went on to make a few movies with the American actor David Carradine, and action-movies like Blood Tracks, Eagle Island, Spökligan, SilverHawk, The Hired Gun, Animal Protector, The Forgotten Wells, The Mad Bunch, Fatal Secret, The Russian Terminator, Babysitter and the short-lived Robert Aschberg-series Nordexpressen.
Due to the early 1990s recession and royalties from The Ninja Mission not reaching Mats Helge and his production company he ceased making films in the mid 90's.
Several of the people that worked in his studio were absorbed into the main stream Swedish film industry, most notably Anders Nilsson, director of Zero Tolerance.
Only five of his films: The Ninja Mission, Bloodtracks, Animal Protector, The Mad Bunch and Fatal Secret are officially available on DVD in Sweden, through Njutafilms.