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Currently you are able to watch "Phineas and Ferb - Season 3" streaming on Disney Plus or buy it as download on Apple TV.
There are no options to watch Phineas and Ferb 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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School's out for the summer, and stepbrothers Phineas and Ferb decide to make each day an adventure, from building a death-defying rollercoaster to surfing tidal waves to locating Frankenstein's brain. Their bold escapades always end up cramping the style of their teenaged sister, Candace, who makes every attempt to expose Mom to what is really going on, but somehow always seems to fail. Meanwhile, the family's simple-minded pet platypus leads a double life as secret "Agent P" and faces off with the evil Dr. Doofenshmirtz to save the world. There's a whole lot of stuff to do before school starts and Phineas and Ferb plan to do it all.