Ep. 21: Yuji returns to Second Earth while Tony infiltrates the High Council
Aired on March 10, 2000

21
Marlene transports a distraught Yuji back to Second Earth during the journey. Meanwhile, Tony utilizes his Sleeper abilities to gain access to the High Council. The conflict escalates as the sky becomes a new arena for survival. In this intense confrontation, the Blue forces have undergone a terrifying mutation, transforming into an unimaginable threat that challenges the protagonists' resolve and survival strategies in the air.
Episodes
- Ep. 17 · Marlene observes Yuji's increasingly strange behavior and his obsession with destroying the Blue.
- Ep. 18 · Miyagi reveals B-cell infestation causing Yuji's mental decline to Marlene
- Ep. 19 · Sleeper Brigades attack Blue while Marlene joins Second Earth mutiny against High Council
- Ep. 20 · Marlene confronts Yuji as Blue forces overwhelm Second Earth in a desperate five-to-one counterattack.
- Ep. 21 · Yuji returns to Second Earth while Tony infiltrates the High Council
- Ep. 22 · Yuji and Marlene infiltrate the Blue-infested Medical Station to confront Tony and rescue civilians.
- Ep. 23 · Yuji and Marlene face Tony in the computer room after Rick's injury
- Ep. 24 · Survivors Rebuild Second Earth Amidst Director Miyagi's Plan and Hidden Gunmen
- Ep. 25 · Yuji investigates a mysterious Blue migration in South America that vanishes without a trace.