3x30 - The Angry Beavers

An old home movie confirms Norb's suspicions that Dagg isn't his real brother. Soon, Norb is "reunited" with his brother Byron (who looks like a super-smart Norbert), while Dagg gets stuck with Byron's "brother" Randy (an incredibly stupid version of Dagget). But Norb grows tired of being the "dumb one" compared to Byron, and begins to wonder about the real meaning of brotherhood.