![](https://thumbnails.cbsig.net/_x/w400/CBS_Production_Entertainment_VMS/2020/10/03/1799740483531/NICKELODEON_TEENAGEMUTANTNINJATURTLES_001_299837_1920x1080.jpg)
Things Change
21M MAY 23, 2003 TV-Y7
S1 E15: After befriending the once-human creatures in an abandoned underground Foot Genetics Lab, the Turtles join them on a journey deeper into the earth, where they come upon the ruins of a once-great subterranean city.