Queen is a stray dog befriended by Tsutomu Hayashi in a future setting. She raised three puppies named Ace, Jack, and Joker, forming a close-knit canine family. Her protective instincts led her to detect an alien bomb disguised as a cactus in the Hayashi home. Recognizing the threat, Queen seized the device in her jaws and fled with her puppies to a wooded area, where the catastrophic detonation destroyed their biological bodies.

Professor Hayashi salvaged the dogs' brains and transplanted them into specialized robotic bodies, converting them into cybernetically enhanced canines. Queen became the leader of this transformed unit, designated alongside her offspring as combatants against extraterrestrial threats. Her new mechanical form grants bipedal movement and advanced combat functions, sometimes featuring centaur-like attributes. She wields integrated weaponry in coordinated strikes against hostile entities.

Operating under Tsutomu's command after his father's death, Queen participates in defensive operations against invaders from Planet Devil. She demonstrates tactical coordination during engagements and exhibits visible concern for Tsutomu's well-being through gestures suggesting an emotional connection despite her cybernetic form.

Queen and her offspring possess transformation capabilities allowing them to merge into a unified spacecraft designated "Liner." This combined form facilitates infiltration of extraterrestrial strongholds, including a base concealed within Mount Fuji and the alien homeworld itself. Their coordinated efforts prove instrumental in neutralizing primary threats like the Moon Bomb that jeopardized Earth's survival.

Her characterization emphasizes maternal loyalty, transferred from her biological puppies to her human companion. This persistent protective dynamic manifests through tactical decisions during combat and nonverbal interactions with Tsutomu following their cybernetic conversion.