Conde Decapitado, also known as Count Brocken, serves as one of the primary lieutenants to the villainous Dr. Hell in the film Mazinger Z: Infinity. His origins lie in the distant past, as he was once a Nazi soldier killed in a vehicular accident during World War II. His remains were later recovered and cybernetically reconstructed by Dr. Hell, which explains his macabre and unique appearance. True to his title, his head is severed from his body and can be seen either clutched under his arm or floating autonomously. He retains elements of his former human life, wearing a tattered military uniform adorned with an Iron Cross medal, and his face is characterized by jagged fangs, a monocular lens replacing one eye, and a distinct pencil mustache with a goatee.

In terms of personality, Conde Decapitado is defined by his unwavering loyalty to his master, Dr. Hell. He holds a fanatical ideology that glorifies conflict, viewing battle as an end in itself and considering peace to be the ultimate form of human decadence. His approach to villainy is ruthless and direct, often employing brutal military tactics to achieve his goals. This puts him in a tense and often hostile rivalry with his fellow subordinate, Baron Ashura (also known as Baron Ashler). The two constantly vie for Dr. Hell's favor, and their mutual sabotage frequently complicates their missions. Despite this intense feud, there are moments where Conde Decapitado displays a grudging respect for his rival, such as when he protects Ashura from other threats.

Within the narrative of Mazinger Z: Infinity, which takes place ten years after the original series' climax, Conde Decapitado resurfaces alongside Dr. Hell to threaten a world that has enjoyed a prolonged period of peace. His primary motivation is to follow his master's orders to seize control of a colossal, newly discovered robot named Infinity and use its power to reshape the world. He and Baron Ashura lead the assault against the Photon Power Laboratory, piloting a new generation of mechanized beasts to challenge the heroic Mazinger Z and its pilot, Koji Kabuto. As Dr. Hell's trusted cyborg lieutenant, his role is to command the airborne fortress Gool and lead the Iron Cross Corps, a paramilitary force of mechanical monsters, directly against Earth's defenders.

Conde Decapitado possesses a range of notable abilities that make him a formidable opponent. His cybernetic body is fully functional independently of his detached head, allowing him to survey a battlefield from one location while his body fights in another. For close-quarters combat, he is proficient with traditional weapons such as a Luger pistol and a saber. In addition, his mechanical frame can be equipped with various biomechanical weaponry, and some iterations of the character show him with enhanced abilities like levitation. However, specific details regarding his character development or a unique arc exclusive to the Infinity film are not available in the search results. His role in the movie primarily serves as a returning, classic antagonist who, along with his master and rival, seeks to overturn the hard-won peace and destroy Mazinger Z once and for all.