The Defeated Youngsters Era is the first era in the Teenagers of the Great Sea Series. It starts officially when the teenagers are beaten at the hands of the MUM, and details all the events in between it, up until it is revealed the Earthbound have been watching the teenagers.

Episodes in the EraEdit

1. The MUM Invasion
2. The Beginning
3. Return to the Great Sea
4. Transdimentional Flux
5. Past Connections
6. Darkness Reigns
7. The Mechanical Menace
8. Mortal Kombat
9. The Deadly Alliance
10. Space Exploration