Megatox

Megatox was a scientist working for Robotnik on a chemical called Mega Mack, the pink liquid that floods the Chemical Plant Zone in Sonic The Hedgehog 2 and is designed to kill Sonic, but the compartment he was working in was flooded with the poisonous substance. By some quirk of fate the scientist, instead of dying, became one with the Mega Mack, and as Megatox he haunted the sewer systems of the Chemical Plant Zone. He faced Sonic early into the hedgehog's rebellion against Robotnik (issue 10); unable to defeat him with simple violence, Sonic drained him from the tunnels he was fighting him in and dispersed him over wasteland.

Megatox returned much later, when Robotnik had been overthrown and the Marxio Brothers had bought the Zone. The Marxios asked Sonic and Tails to check out strange happenings in the Zone, which turned out to be Megatox charging himself up to be blown out of the chemical plant and dump himself all over Emerald Hill Zone, leaving it uninhabitable. Annoyingly for Megatox, Sonic had forgotten who he was and even when he remembered he manages to get his name wrong. Megatox was more powerful now, able to change from liquid to solid state and back again. Sonic, despite being heavily poisoned by Mega Mack, deduces that Megatox has to be solid to hit him and manages to attack him a split second before contact. This defeated Megatox, and he was swept up and removed by the Marxios.

Megatox's last appearances was as one of the enemies that Robotnik, in his god-like state, resurrected to battle Sonic in Showdown (issue 130).

Megatox is a purple mutant bonded with Mega Mack with green and red eyes. Megatox can bend the Mega Mack around him to his will, shooting it at high pressure and splitting his consciousness into multiple Mega Mack 'bodies'.

Nigel Kitching once revealed that Megatox was only brought back at the request of his son.