Overview
The Foot Clan (also known simply as the Foot) is a fictional ninja clan in the Teenage Mutant Ninja Turtles comics and all related media and are the main antagonist faction. It is led by the devious Shredder and his second in command Karai. The Foot Clan was originally a parody of the criminal ninja clan The Hand in the Daredevil comics. In addition to the obvious similarity in their names, both clans originate from Feudal Japan, practice ninjutsu and black magic, and are now powerful global organized crime rings who are familiar with multiple illegal activities such as drug smuggling, counterfeiting of money, gunrunning, murder, assassination, computer hacking, theft, and terrorism.
Eastman and Laird's Teenage Mutant Ninja Turtles
In the universe of Eastman and Laird's Teenage Mutant Ninja Turtles, the Foot Clan was founded in Feudal Japan by two men named Sato and Oshi. In Volume 1 Issue 47, the Turtles and Time Mistress Renet traveled to a time prior to the Foot's creation. There, Raphael met Sato and Oshi, and, not realising who they are, he taught them about Ninjutsu. After the Turtles returned to the present, Sato and Oshi decided to follow the ways of the ninja.
The Foot Clan are the most feared clan of warriors and assassins in Japan. Both Hamato Yoshi and Oroku Nagi were members, until one day, Nagi attacked Yoshi's love Tang Shen and Yoshi killed Nagi. Dishonored, Yoshi and Shen fled to New York City, while Nagi's younger brother Oroku Saki was adopted by the clan and was trained to become a fierce ninja. When he was ready, Saki was sent to America to head the New York branch of the Clan. Under his leadership, it took only a year for it to become a powerful and fearsome group.
After Shredder's death, the American Foot fell apart, and the Foot Soldiers began fighting against Shredder's elite guard. Karai, a clan leader from Japan, came here to stop the clan war. She enlisted the Turtles' help in this, in exchange for promising that no Foot shall ever try to avenge the Shredder again. This peace treaty is still in effect in Volume 4 of the comic.
From Wikipedia (CC BY-SA 4.0).