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The Foot Clan is a fictional ninjutsu clan that is usually led by The Shredder and as such, they are the Ninja Turtles' and their friends main antagonists.
The Foot Clan consist of a multitude of faceless ninjas who exist to do battle with the heroic Turtles and although most individual Foot Ninja's tend to fall rather easily, they are anything if persistent and continually return to take more punishment.
The Foot was originally a parody of the criminal ninja clan The Hand in Marvel Comic's, Daredevil. In addition to the obvious similarity in their names, both are ninja clans that originate from feudal Japan, practice ninjutsu and black magic, that now run powerful international organized crime rings who are familiar with multiple illegal activities such as drug smuggling, arms running, and most certainly assassination.