Paull appears briefly in a "movie within a movie" in
Ensign Pulver (1964). He is not listed in the "Ensign Pulver" cast credits, but he is
credited on-screen in "Young Dr. Jekyll Meets Frankenstein", a movie being watched by the ship's crew. "Young Dr. Jekyll etc." was fabricated using some new shots of Paull and other actors, inserted into old footage from
The Walking Dead (1936), an actual Warner Brothers release that starred
Boris Karloff and
Edmund Gwenn, who also
are credited on screen. Paull's credit reads "And introducing Morgan Paull as "Young Dr. Jekyll".