 The animals you free in the bonus games at the end of Toxic Caves  and The Machine include Tails, as well as the supporting cast of  _"Sonic the Hedgehog" (1993)_ (qv) and the Archie comic book:  Princess Sally, Boomer/Rotor, Bunnie, and Muttski. The Cluck bots  that invade Toxic Caves and Lava Powerhouse are based on Robotniks  mechanical pet, also from the same show. Finally, the chicken bots  circling the capsule in The March bonus are based on Scratch, one of  Robotniks incompetent cronies from  _"Adventures of Sonic the Hedgehog, The" (1993)_ (qv).