A/N: Super Mario Bros Z vs Sonic Heroes.

Turbo Mecha Sonic from Super Mario Bros Z.

(Turbo Mecha Sonic is not a boosted version of mecha Sonic. He's metal sonic who attains the form after absorbing Silver Sonic and Mecha Sonic).

Neo Metal Sonic (as well as his Metal Madness and Overlord forms) from Sonic Heroes.

Austin: two metal sonics for the price of one.