[6] After brainwashing Arina to his side, the Space Time Demon Etelgar went on a quest to seal all Heisei Ultra Warriors in existence, with the recent being Cosmos on Planet Juran, who had separated Musashi to save his host while Ultraman Zero chased them within various dimensions.

Zero fought Etelgar but even his strongest attack was easily shrugged off and only forced the latter to escape out of annoyance while Arina placed the captured Ultras on a hostage situation towards Hikaru.

The success of their training taught them to cooperate and this allowed the UPG members to escape from Arina's fear-inducing influences and break the Ultras free from their imprisonment.

Joined by the rest of the Heisei Ultra Warriors, the group marched towards the tower, but Etelgar created multiple copies of their past enemies, leaving Cosmos and Gingavictory to reach the upper level.

Through Hikaru's persuasion, Arina manages to regain her memories and finally brought by Cosmos from safety, as Gingavictory resumes battle.

With the rest of the Heisei Ultras return, Musashi/Cosmos volunteer to deliver Arina to her home after entrusting the safety of the Earth to UPG, Hikaru and Sho.