The credits on the version of this movie which exists today are actually for the movie Mad Doctor of Blood Island (1968) and bear no relation to this film. This comes from when they were originally intended to be released as a double feature.
Riffed by the guys from MST3K under the Rifftrax name, Michael J Nelson, Bill Corbett and Kevin Murphy.
Also released/available under the title: The Revenge of Doctor X.
Final role of James Yagi.