The Sky Ranger
The Sky Ranger is a 1921 American comedy film serial directed by George B. Seitz. The film is considered to be lost.
On the day of their engagement, George and June are abducted on a plane which takes them to Tibet. Dr. Santro Semels, Murdochs accomplice is the culprit. He and his wife Tharen leave the two in the hands of angry Tibetans. The two lovers are locked into a box with only a tiny hole in it through which they can see some food that is out of their reach. As if that wasnt enough suffering, one of the abductor decides to shoot them through the box. George miraculously opens the box with a rock he had picked up before. As he tries to capture two horses, June is taken away in the desert by a Tibetan. George follows the traces left by his horse and rescues June in time.
Source: Wikipedia
