The Flying Torpedo (1916)

In the future (1921), an alliance of several foreign countries plot to attack the US. American officials, coming to the realisation that the country is basically defenceless, offer $1,000,000 to anyone who can come up with a weapon to defeat the invaders. Winthrop Clavering, a writer and inventor, hears of the reward and tells his friend Bartholomew Thompson, a scientist and inventor who has been working on developing flying torpedo. However, enemy agents have also heard about Thompson's project, and set out to kill him and steal his plans. This film is now considered lost.

Unfortunately the movie The Flying Torpedo is not yet available on HBO Max.