In the fourth film, the Foot is now under leadership of Karai, who has taken control after the Shredder's demise. They have grown in numbers and skill, and offer their services as mercenaries in the film. They are hired by Max Winters to track down and bring in the 13 monsters arriving in New York City. Eventually, they later learn of his intention to send the monsters back to their world with a portal, and that his stone generals have betrayed him by substituting Leonardo for the thirteenth monster in order to use the portal to bring in a new army of monsters to take over the Earth. It was then the Stone Generals demand that Karai and the Foot Clan serve them, but they refused, as they want to honor their deal with Winters. Without hesitation, Karai orders the Foot Clan to help April and Casey find the last monster and lure it into the portal while the Turtles fights the Generals as well as Winters and Splinter warding off new more coming from the portal. After the final monster is sent in to the portal along with the Stone Generals, Karai and the Foot Clan peacefully part ways with the Turtles, reminding them of the Shredder's possible return.