← Previous Next → 1x15 Notes from the Underground (3) First Aired: May. 24, 2003 on The CW Summary: Discovering a vast underground city, the Turtles and the Mutations stumble on the sole survivor of an ancient civilization, who seemingly wishes to provide the Mutations with the opportunity to return to normalcy, but can he be trusted?

Main Characters in this Episode

• Leonardo
• Michelangelo
• Donatello
• Splinter

Guest Stars Raphael voiced by Gregory Abbey Quarry voiced by Eric Stuart (III) April O'Neil voiced by Veronica Taylor The Entity voiced by David Zen Mansley Sydney voiced by Megan Hollingshead