A metahuman is someone exposed to some mutagenic compound, such as in the form of a gas, that mutates them down to their DNA, either giving them a superpower or altering their appearance drastically.

See, also, Bang Baby
Bang Baby (a metahuman created by the metagas created by Alva Industries)
by DanMat6288 February 18, 2005
Get the metahuman mug.