Judalah, who adopts the human alias Judy, is a supporting character introduced as a spy from the planet Boazan. She belongs to the hornless class of Boazanians, a group that is treated as slaves and second-class citizens by the ruling horned elite. Her physical appearance as a hornless Boazanian allows her to blend in more easily with humans, which is key to her mission.

Her background is one of coercion and desperation. She is sent to Earth and tasked by the antagonist Prince Zardoz to infiltrate Camp Big Falcon, the base of operations for the Voltes V team. Her primary motivation is not loyalty to the Boazanian cause but the safety of her younger sister, Amira, who is held hostage by Zardoz to ensure Judalah's compliance. This coercive dynamic shapes her actions, forcing her into a role she might otherwise reject.

Personality-wise, Judalah is initially presented as reserved and observant, a necessary trait for a spy. However, as she spends more time among the humans at Camp Big Falcon, she begins to experience a genuine internal conflict. She develops a sense of belonging and empathy towards the people she is meant to betray. Her interactions, particularly with the pilot Big Bert Armstrong, cause her to question her mission. This emotional awakening leads to a shift from a reluctant operative to a rebellious figure who ultimately defies her masters. She demonstrates resourcefulness and bravery, such as when she saves Steve Armstrong from Boazanian soldiers and later attempts to assassinate Prince Zardoz.

In the story, Judy's role evolves significantly. She begins as a hidden antagonist, using a recording device disguised as a necklace to gather intelligence on the Voltes V team. However, she becomes a source of misinformation for Zardoz, providing him with false names and playing dumb to protect the pilots. When her cover is eventually compromised, she becomes a fugitive. After a period in hiding, she resurfaces as a member of the Boazanian rebel forces led by Hrothgar, who is secretly the Armstrong brothers' father, Dr. Ned Armstrong. She then actively fights against the empire she once served.

Key relationships are central to her character arc. Her most important relationship is with Robert Big Bert Armstrong. She unintentionally catches his attention, and he saves her from harassment early in her mission. Their bond deepens, and Bert develops strong romantic feelings for her, unaware of her true nature. This relationship is the primary catalyst for her change of heart, as she falls in love with him and struggles with her orders to betray him and his family. Her relationship with her sister Amira is also a constant driving force behind her actions. Additionally, her interaction with Steve Armstrong is notable; after saving him, she reveals the truth about the Boazanian class system before knocking him unconscious to escape on her own.

Over the course of the series, Judalah undergoes a clear development from a coerced spy to a redeemed ally and hero. She rejects her original masters, joins a rebel faction, and eventually reunites with Big Bert during the final battle against Emperor Zambojil's forces. Following the end of the conflict, she finds her happy ending, returning to Earth with the Camp Big Falcon crew and officially beginning a life with Bert.

Judalah possesses notable abilities and equipment that aid her in her espionage work. She uses a necklace that can record footage and transmit it back to her Boazanian handlers. She also has a wrist-mounted device that allows her to teleport, which she uses to travel to the Boazanian base to deliver her reports and to escape from dangerous situations. She is also shown to be proficient with a blaster and other forms of combat.