Part 7/8:
The final showdown occurs at Winters' tower, where party and chaos ensue as the Turtles, along with April and Casey, face off against the army of ninjas and stone generals. In the midst of confusion, they discover that Winters, although initially antagonistic, seeks to end the curse of immortality for himself and his generals by sending the monsters back through the portal.
After a series of battles, the Turtles unite, employing combined efforts to overcome the generals and seal the portal. With the reluctant assistance of Casey and April, they manage to capture the missing monster, effectively closing the portal and concluding the sequence with Winters' sacrifice for the greater good.