Shinkalion E5 Hayabusa and Shinkalion Doctor Yellow begin a decisive battle with Agent Byakko in the Underground World. While Hayato is growing, Ryūji's Doctor Yellow also demonstrates amazing power. The two Shinkalions pursue Byakko with outstanding cooperation.
However, the way Hayato is attacking looks strange, and Ryūji seems to know what he's planning. What exactly is their intent...?
In the episode
English dub changes
Note: All characters are listed in order of their first appearances in the episode. The time they appear is the time from the Japanese dub.