Quiz: Name the only movie to have its sequel released in the same year?

Update: Hint. it was made when movies were in black and white?
Update 2: The Son of Tarzan (1920) is a 15-chapter film serial which focuses on the coming of age of Jack Clayton, also known as Korak, the son of Tarzan and Jane. The serial was produced by David P. Howells, written by Roy Somerville (based on the 1915 novel The Son of Tarzan by Edgar Rice Burroughs), and directed by Arthur... show more The Son of Tarzan (1920) is a 15-chapter film serial which focuses on the coming of age of Jack Clayton, also known as Korak, the son of Tarzan and Jane. The serial was produced by David P. Howells, written by Roy Somerville (based on the 1915 novel The Son of Tarzan by Edgar Rice Burroughs), and directed by Arthur J. Flaven and Harry Revier. The film was released starting in the summer of 1920, with the final chapter released in January 1921. This is not considered a sequel. Look ahead to the next decade.
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