Scarlet Cypher appears in *Bodacious Space Pirates: Abyss of Hyperspace*, working for the Yggdrasil Group with expertise in subspace navigation and submersible operations. Her background remains largely undefined, though she was previously identified as one of Professor Mugen's fellow subspace divers and comrades, known by the nickname "Carlie." This association places her among the group exploring subspace depths alongside the professor prior to the film's events.

Physically, Scarlet possesses blue eyes and long blonde hair, typically tied in a bun with a tail and curled sections framing her face. She often wears red lipstick and sunglasses. Her attire features a black sleeveless dress with red lining and a see-through section on the upper chest, complemented by gold bracelets, tights, and red high-heeled shoes; she sometimes adds a red coat. During operations at comet Hrbek Oda, she dons a jagged red spacesuit and a triangular helmet. In her youth, her attire differed slightly: a similar black and red dress with a large brown belt, goggles, and shorter hair. Notably, during a deep subspace dive in the Flawen submersible, a glowing red pattern manifested along her skin and suit, its origin undetermined.

In the film's narrative, a high-ranking Yggdrasil member hires Scarlet to secure Professor Mugen's legacy, specifically the advanced submersible Advaseele. She accepts without knowing Yggdrasil's ultimate intentions, driven by personal curiosity about the professor's discoveries. Her involvement begins when she observes the Bentenmaru's escape, remarking on their competence while noting Yggdrasil's remaining tactical options. She later travels to New Okuhama City, visiting the Yggdrasil-controlled restaurant Lerad's and the Lamp House café. There, she interacts with Marika Kato, acknowledging awareness of a non-aggression pact concerning Marika and hinting at utilizing local alliances.

Scarlet leads the boarding party onto Professor Mugen's ship within comet Hrbek Oda after Yggdrasil intercepts the Bentenmaru. Confronting Marika and Kanata Mugen at the Advaseele's chamber, she reiterates her ignorance of Yggdrasil's goals, emphasizing her personal interest. This prompts Marika to suspect a prior connection. When Kanata asks her name, triggering his recollection of his father's diving comrades, the robotic bird Flint emerges shouting "Carlie," causing disruption that leads to the Advaseele's release. Scarlet pursues Kanata but is intercepted by Ririka Kato; their hand-to-hand combat forces Scarlet's temporary retreat due to escalating structural damage.

Undeterred, Scarlet pilots a Flawen submersible into subspace alongside two others, pursuing the Advaseele as Kanata pilots it deeper. She contacts Kanata, attempting to persuade him to surrender by referencing his resentment toward his father's subspace obsession. Kanata refuses, determined to witness the "radiance" his father sought. After the Advaseele transforms, Scarlet orders explosives launched at it, an attack thwarted by the Bentenmaru's missile barrage. She evades destruction and continues pursuit but is eventually forced to surface by her craft's emergency systems at unsustainable depths. Struggling briefly, she looks toward Kanata and quietly acknowledges their shared nature.

Her skills include proficiency in piloting subspace submersibles like the Flawen and competence in unarmed combat, demonstrated by briefly matching Ririka Kato. Based on Professor Mugen's statements, she is also capable of constructing her own submersibles.

Her relationship with Professor Mugen is defined by their shared history as comrades in subspace diving, though the exact bond remains unclear. While initially antagonistic towards Kanata due to her Yggdrasil alignment, little active hostility exists between them. Post-film, a Drama CD reveals Kanata later resides at Scarlet's residence while assisting with subspace salvaging work, indicating a shift towards a cooperative or neutral dynamic following the conflict over the Advaseele.