Sonic the Hedgehog (Mirror Dimension) (Boom)

Past
For an unpresented amount of time, Sonic has worked with his team under Knuckles the Echidna's leadership to thwart the evil ambitions of Dr. Eggman, the arch enemy of Knuckles.

Season one
Amidst a battle with Eggman's Octopus Bot and Badniks, during which Sonic was in need of help after messing up, Knuckles got transported to the Sonic Boom World by Octopus Bot after he took over for Sonic. Though Sonic failed to save Knuckles due to his clumsiness, Knuckles soon returned to help him battle more Badniks.