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Currently you are able to watch "Hey Arnold! - Season 3" streaming on Paramount Plus, Paramount Plus Apple TV Channel , Paramount+ Roku Premium Channel, Paramount+ Amazon Channel or buy it as download on Apple TV, Amazon Video, Fandango At Home.
Arnold campaigns to save the neighborhood's oldest tree, accidentally kills Eugene's gold fish, trains Grandpa for a checkers tournament, hunts down Timberly's missing doll, and teaches Gerald to ride a bike. Did we mention he also saves Sid's life?