|Season Monsuno: World Master, Episode 3|
|Air date||March, 1, 2012|
Underground is the third episode of Monsuno: World Master. It first aired on March 1st, 2012.
The three heroes venture into the big city of Axistown to find any trail of Jeredy Suno that they can. The three meet up with a rich old woman who sends them into The Underground on Jeredy's trail. However, the Underground is a fight club for Monsuno. The heroes find themselves embroiled in a fight for the coveted vial of Monsuno Essence, which Jinja will use to create Charger.
- This episode debuts the red colored/Eklipse colored Monsunos.