Teenage Mutant Ninja Turtles · SEASON 2
Return to the Underground
Episode 13 · 2004-03-06

- Action & Adventure
- Animation
- Kids
Episode overview
The Turtles return to the underground city but they find the city is now abandoned, it's crystal moon power source missing, and it's human population reduced to monsters. Can an unstable serum created by Donatello restore the humans to normal?
21 minutes
Season 2 episodes
1. Turtles in Space (1): The Fugitoid2003-11-08
2. Turtles in Space (2): The Trouble with Triceratons2003-11-15
3. Turtles in Space (3): The Big House2003-11-22
4. Turtles in Space (4): The Arena2003-11-29
5. Turtles in Space (5): Triceraton Wars2003-12-06
6. Secret Origins (1)2004-01-17
7. Secret Origins (2)2004-01-24
8. Secret Origins (3)2004-01-31
9. Reflections2004-02-07
10. The Ultimate Ninja2004-02-14
11. The Return of Nano2004-02-21
12. What a Croc2004-02-28
13. Return to the Underground2004-03-06
14. City at War (1)2004-03-13
15. City at War (2)2004-03-20
16. City at War (3)2004-03-27
17. Junklantis2004-04-03
18. The Golden Puck2004-04-10
19. Rogue in the House (1)2004-04-17
20. Rogue in the House (2)2004-04-24
21. April's Artifact2004-05-01
22. Return of the Justice Force2004-05-08
23. The Big Brawl (1)2004-05-15
24. The Big Brawl (2)2004-09-18
25. The Big Brawl (3)2004-09-25
26. The Big Brawl (4)2004-10-02