director? Or directors?

The credits on the video say the director was "Richard Robinson," who is also given a story credit.

David Worth has multiple credits on the video, including producer, d.p. and editor. There are several people named Robinson in the credits -- just as there are in Chris Robinson's other credited films, and Ted Cassidy appears in all three films attributed to Chris Robinson.

But do we know for a fact that Worth and Chris Robinson shared direction here?

Seems to me it might be the Richard Robinson who co-wrote Piranha for Roger Corman.