Ep. 4: RD Discovers Fire Phoenix as Zero's Combining Partner Amidst Savage Hammer's Challenge
Aired on October 24, 2003

4
RD determines that the ZOIDS capable of combining with Zero is the Fire Phoenix, which is currently undergoing testing. Simultaneously, Mach Storm accepts a ZOIDS battle challenge issued by Savage Hammer. The narrative focuses on the revelation regarding the specific unit suitable for combination with Zero while highlighting the impending conflict between Mach Storm and Savage Hammer. This sequence establishes the technical details of the Fire Phoenix's development status and sets the stage for the competitive engagement requested by the opposing party. The events underscore the strategic importance of the newly identified combining mechanism within the ongoing series context.
Episodes
- Ep. 1 · RD transports stolen jewels while being attacked by rival team members
- Ep. 2 · Mach Storm seeks revenge against the powerful combined ZOIDS known as Killer Spiner
- Ep. 3 · Mach Storm anticipates ZODIS combination potential while Savage Hammer attacks with a combined Buster Eagle and Berserk Fury
- Ep. 4 · RD Discovers Fire Phoenix as Zero's Combining Partner Amidst Savage Hammer's Challenge
- Ep. 5 · Matt Chooses to Ride Leoblaze Alone to Save His Home
- Ep. 6 · RD and Sigma accept a request from Helmut's friend Harudo to guard his route through dangerous wasteland.
- Ep. 7 · RD Investigates Invisible Legendary ZOIDS Attacking Blue City
- Ep. 8 · Leo Striker Calls Out as Sigma Disappears After Defeat by Zaber Fang Holotech