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Currently you are able to watch "Dexter's Laboratory - Season 3" streaming on TELETOON+ Amazon Channel, StackTV Amazon Channel, fuboTV or buy it as download on Apple TV, Microsoft Store.
There are no options to watch Dexter's Laboratory 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.
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In Season 3, Dexter's scientific methods create all kinds of madness. Dexter accidentally shoots his mom with a laser beam and gives her super hero powers. He is forced to team up with his hated rival Mandark to try and save Earth from asteroids. And Dexter even tries his hand at sports, but realizes he's best equipped to fight monsters in his lab!