Watch The Magnetic Telescope - Original 1942 Fleischer Studios Superman Cartoon - Full Episode video on DTube
Aired on April 24th, 1942 and produced by Fleischer Studios, some information about this episode from Wikipedia:
The story runs about eight minutes and covers Superman's adventures in saving the town from a comet drawn toward Earth by a magnetic telescope.
Fleischer Studios is most well known for Betty Boop and Popeye the Sailor.
Other Superman Episodes on DTube
Episode 1 - Superman a.k.a. The Mad Scientist
Episode 2 - The Mechanical Monsters
Episode 3 - Billion Dollar Limited
Episode 4 - The Arctic Giant
Episode 5 - The Bulleteers
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