Never mind the Caribbean! These are the pirates of the future! Pirates of 1920 gives an (incomplete) glimpse into how 1911 imagined buccaneers to plunder the riches of the high seas a whole nine years hence. Airships were ubiquitous in film and, by this point, in real life. It was only natural to explore how the technology might be misused by ne'er-do-wells rather than employed in the service of exploration and discovery, ala Georges Méliès.
Méliès' final Scientific Romance, Conquest of the Pole, would be released only a year after Pirates of 1920, which is fitting in a way. Both films have taken the short trick film of cinema's earliest years to their greatest length. Around 20 minutes is the most they can sustain before becoming the full-length feature films of the Twenties, expanded with more engaging plots and larger effects budgets. This is one of Scientific Romances' last hurrahs.