The Masked Rider (film)

The Masked Rider is a 1919 American drama western film serial directed by Aubrey M. Kennedy. Scenes were filmed in Texas and Mexico. The serial was considered to be lost in entirety. However, most episodes have been found, although many are incomplete. The Masked Rider is considered to be the first film serial about a masked cowboy. The 15episode serial is also significant for being the earliest surviving film appearance of actor Boris Karloff.

Source: Wikipedia