Sonic Boom - Season 1 Episode 35 -

In an alternate dimension where Knuckles is the smart leader of the team, a freak accident causes him to end up in the normal dimension, and everyone begins to like him better that the original. But when they find out that two Knuckles in the same dimension will cause the dimensions to explode, Sonic and Tails decides to try to send the alternate Knuckles back home.