Ep. 21: X City's Gate Guardians
Ipinalabas noong Pebrero 25, 2006
21
Mga Episode
- Ep. 17 · Finally Understand! Team ST's Secret
- Ep. 18 · A New Assassin! The Test's Battle Between Siblings
- Ep. 19 · Showdown! Flame Kaiser VS. Thunder Emperor
- Ep. 20 · Formidable Opponent! Ninja Rider Koei
- Ep. 21 · X City's Gate Guardians
- Ep. 22 · Arrival! X City
- Ep. 23 · The Idaten Battle Tournament Begins!
- Ep. 24 · Crash! Flame Kaiser VS. Neptune
- Ep. 25 · Hammerhead! The 6th Idaten Bike