Bemular emerges as an enigmatic antagonist targeting Shin Hayata and his son Shinjiro. His initial attack on a plane, captured on video, triggers Shin Hayata's lost memories of hosting Ultraman. Bemular later confronts Shinjiro, leading to a battle where Shin Hayata intervenes and suffers grave injuries. During this clash, damage to Bemular's armor reveals his reptilian physiology. Dialogue hints Bemular held back in fights with Shin Hayata, suggesting concealed motives. His agenda expands beyond targeting the Hayatas. Bemular collaborates with antagonists like Adad under orders, yet also displays compassion by saving Seiji Hokuto's life, citing prior experience rescuing humans. He later allies with Seiji to protect civilians during alien attacks in New York, contributing to defeating Alien Pedan by combining his Spacium Beam with the Hayatas' attacks, signaling a shift toward the protagonists. Critical revelations occur when Shin Hayata discloses Bemular is the original Ultraman. After the Land of Light's destruction, Ultraman possessed a deceased reptilian alien's body, adopting the Bemular persona for covert operations. This explains his knowledge of Ultraman history and protective actions toward Rena Seyama, whom he informs of her non-human origins and provides defensive technology. Confronting Alien Temperor, leader of the Zetton Core, provokes Bemular's true loyalties when Temperor admits responsibility for devastating the Land of Light. A rage-filled attack leaves Bemular fatally injured, including a crushed skull. Emergency intervention reveals his body was merely a host vessel, allowing Ultraman's essence to transfer into Shinjiro's original armor. This transition enables Ultraman's reemergence in his classic form during a subsequent crisis. Bemular utilizes advanced technology and biological capabilities. His armor features a Color Timer-like light and secondary retractable arms capable of piercing Ultraman Suits. Combat abilities include energy projection like heat rays, light bullets, energy slashes, a potent energy sphere, flight, and the signature Spacium Beam. He employs holographic human disguises and possesses regenerative healing, evidenced by recovery from severe damage like losing half his body. His final act involves confronting Zetton Core forces, directly challenging Alien Temperor before his apparent death. Post-mortem analysis confirms his body was a host, and the extraction of the Beta Capsule from his armor facilitates Ultraman's return, concluding Bemular's role as a vessel.