Viewers familiar with the "Flash Gordon" serials will immediately spot Charles Middleton, playing the villainous "Pa Stark," who previously portrayed the infamous "Emperor Ming." Beyond that initial connection, however, the film bears little resemblance to its source material, awkwardly compressing fifteen episodes of crime-solving into a ninety-minute runtime. The narrative centers on how the main detective, Ralph Byrd, and his determined companion, Lynne Roberts as “Gwen,” pursue the ruthless "Stark" gang. These criminals are engaged in numerous illegal activities, but it's their global schemes—including spying and destruction—that capture the detective’s attention. Like with "Flash Gordon," these stories were more effective when presented as weekly installments, each ending on a cliffhanger. Assembling everything into this single film diminishes much of the suspense we would have experienced waiting for the next episode, ultimately reducing the story to a somewhat repetitive sequence of gunfights, beatings, seemingly catastrophic events, and the predictable scenario of the damsel in distress—though there's no opportunity to connect with the irritating "Junior" (Jerry Tucker). The production values are modest, and the writing fails to add much excitement to this rushed adaptation, making it ultimately unremarkable. Seeing the original series is far preferable.

Source on TMDB