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Currently you are able to watch "Sealab 2021 - Season 3" streaming on fuboTV or buy it as download on Apple TV.
There are no options to watch Sealab 2021 for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
This is a remake using old animation from Hanna-Barbera's Sealab 2020, which was an educational cartoon about the environment. The premise for Sealab 2021 is that all of the characters have gone insane.