Teak, younger sibling to Sea Kingdom heir Sirius, often joins his brother in playful pursuits like jellyfish catching. When Sirius enters forbidden waters and collapses after encountering fire princess Malta near the Holy Flame, Teak saves him from being drawn into the whirlpool imprisoning wind deity Argon.

Teak deeply admires Sirius, addressing him affectionately as "aniki" (big brother). Discovering Sirius's secret meetings with Malta sparks jealousy in Teak. This erupts into anger when jellyfish injure sea creatures during Sirius's absence, leading Teak to confront his brother about neglecting his duties.

His loyalty compels him to attempt freeing Sirius after the latter is imprisoned for his forbidden relationship with Malta. Rival salamander Mabuse manipulates Teak, suggesting he steal the powerful rulership artifact, the Eye of Argon, to aid Sirius's escape. Though reluctant, Teak agrees and presents the plan to Sirius. Sirius refuses, declaring himself unworthy of kingship, and orders Teak to return the Eye to their father, Glaucus.

While returning the Eye, Mabuse ambushes and steals it. Teak later recovers the artifact but faces skepticism from sea guards questioning its authenticity. Frustrated, Teak nears Argon's prison chasm to deliver the Eye. He reconsiders, yet the Eye's power pulls him into the whirlpool. This act frees Argon, unleashing catastrophic destruction across ocean and land. Glaucus ultimately defeats Argon permanently. Mortally wounded, Teak emerges and, with his final words, urges Sirius to find Malta before succumbing.