After brainwashing Arena to his side, the Space Time Demon Etelgar goes on a quest to seal all Heisei Ultra Warriors in existence, with the recent being Cosmos on Planet Juran, who has separated Musashi to save his host while
Ultraman Zero chases him within various dimensions. On Earth, UPG members celebrate Hikaru's return from a year-long trip as he is introduced to two new members Sakuya and the rebuilt Mana. The party is interrupted by Arina and Etelgar's arrival as Victory and Ginga fight the giant demon but to no avail. Musashi joins the UPG and manages to warn the Ultras to cancel their transformations before Arena seals them on time. During the team's recuperation and Musashi's introduction, Etelgar attacks the vicinity of Live Base as Arena fights the UPG members and Sho's attack brings her to her senses. However, the golden being has fabricated her memory into a trauma centred around Ginga and puts her under his control once more. Zero fights Etelgar but even his strongest attack is easily shrugged off and only forces the latter to escape out of annoyance while Arena places the captured Ultras on a hostage situation towards Hikaru. While the UPG members go to infiltrate the Space Time Castle, Hikaru and Sho are placed under Zero's tutelage. The success of their training teaches them to cooperate and this allows the UPG members to escape from Arena's fear-inducing influences and break the Ultras free from their imprisonment. Musashi rejoins with Cosmos and the rest of the Heisei Ultras empower the Ultra Fusion Brace. As things go beyond his expectations, Etelgar manipulates the citizens' fears and creates a gigantic copy of Dark Lugiel. Hikaru and Sho perform the Ultra Touch and bring forth an Ultra Warrior resulted from their alter-ego's combination: Ultraman Gingavictory. The new figure easily phases through Dark Lugiel's attack and destroy him via Gingavictory Breaker. Joined by the rest of the Heisei Ultra Warriors, the group marches towards the tower, but Etelgar creates multiple copies of their past enemies, leaving Cosmos and Gingavictory to reach the upper level. Etelgar and Arena attacks them with their full strength until Cosmos assumes Eclipse Mode, purifying Arena from Etelgar's influence. Through Hikaru's persuasion, Arena manages to regain her memories and finally brought by Cosmos from safety, as Gingavictory resumes battle. The other Ultra Warriors emerge victorious from their battles and Gingavictory chases Etelgar to space, now finally realises his true motives behind the captures of the Ultra Warriors, which is due to their bonds with humanity before finishing him for good with Ultra Fusion Shoot. The rest of the Ultra Warriors soon destroy the Space Time Castle with Crossover Formation. With the rest of the Heisei Ultras return, Musashi/Cosmos volunteers to deliver Arena to her home after entrusting the safety of the Earth to UPG, Hikaru and Sho. Sho is later recruited into the ranks of UPG and the rest of the crew salute to the viewers after the ending credits roll. ==Production==