Master Crane, also known as the Crane Hermit or Master Shen, is a human martial arts master who serves as a major antagonist in the early portions of the Dragon Ball series. He is the founder and head of the Crane School, a martial arts institution that prioritizes lethal efficiency and victory by any means necessary, standing as a dark counterpart to Master Roshi and the Turtle School. Master Crane is the older brother of the infamous assassin Mercenary Tao, and the two share a complicated history rooted in rivalry despite their familial bond. In his youth, Master Crane trained alongside Master Roshi under the legendary martial arts teacher Mutaito at the Mutaito Training Academy, where the two were initially comrades. However, the traumatic events of the war against King Piccolo, which resulted in the deaths of many of their comrades and ultimately the death of Mutaito himself after he sealed the demon away, caused a profound shift in Crane's outlook. While Roshi chose to carry forward Mutaito's noble teachings focused on self-improvement and discipline, Crane became disillusioned with the concept of mercy and peace, believing that only ruthless strength and survival truly matter in a violent world. This ideological split led him to abandon his master's philosophy and establish the Crane School, which openly embraces assassination tactics and lethal combat as the ultimate expression of martial arts. Crane's personality is characterized by his cold, calculating, and deeply bitter nature. He is portrayed as underhanded, unpleasant, and entirely devoid of the jovial warmth that defines his rival Roshi. His primary motivation throughout the series is an obsessive desire to prove the supremacy of the Crane School over the Turtle School, driven by a long-standing grudge against Roshi and a need to avenge his wounded pride. He believes in winning at any cost, and he instills this same ruthless philosophy into his two star students, Tenshinhan and Chiaotzu, whom he molds into cold-blooded killers to serve as his proxies in his feud with the Turtle School. He uses manipulation, emotional coercion, and outright threats to control his students, viewing them more as tools for his revenge than as individuals deserving of respect. In the story, Master Crane first makes a direct appearance during the 22nd World Martial Arts Tournament, where he enters Tenshinhan and Chiaotzu as his champions to counter Master Roshi's students Son Goku, Krillin, and Yamcha. Throughout the tournament, he acts as a puppet master from the audience, ordering his students to use dishonorable tactics such as telekinetic paralysis and assassination attempts. He is enraged when he learns that his younger brother Tao Pai Pai was defeated by Goku three years prior. During the final match between Goku and Tenshinhan, Crane orders Chiaotzu to freeze Goku's movements and commands Tenshinhan to kill Goku, but Tenshinhan, developing his own sense of honor, refuses. This leads to a confrontation where Crane attempts to kill both Goku and Tenshinhan himself, only to be blasted away by Roshi's Kamehameha. Following this humiliation and the departure of his students, who reject his dark teachings, Crane returns three years later at the 23rd World Martial Arts Tournament seeking revenge. He brings his brother Tao Pai Pai, now rebuilt as a cyborg, to the tournament to exact vengeance on both Goku and Tenshinhan. However, Tao is easily defeated by Tenshinhan, who has grown significantly stronger. After Tenshinhan knocks Tao unconscious and warns Crane never to bother him again, Crane is forced to carry his brother away and retreat from the arena in shame. His key relationships are defined by his rivalries and his manipulative control over others. His lifelong rivalry with Master Roshi is the central conflict of his life, representing the clash between two opposing philosophies of martial arts. His relationship with his younger brother Tao Pai Pai is strained, marked by petty squabbles that escalated into a falling out, though Crane still relies on Tao's strength to pursue his revenge. Most significantly, his role as a teacher to Tenshinhan and Chiaotzu is defined by toxic manipulation: he values their loyalty only as long as they remain obedient instruments of his will, and their eventual rebellion serves as a direct rejection of his entire worldview. Crane's character development is limited; he remains a static figure consumed by his bitterness and desire for revenge. His most notable moment of change comes not within himself but through his students, as Tenshinhan and Chiaotzu break free from his influence and forge their own paths toward redemption with the Turtle School's ideals. Crane himself never learns or grows, persisting in his malice even after his defeats. In terms of notable abilities, Master Crane is a skilled martial artist with deep knowledge of the Crane School's signature lethal techniques. He is capable of using the Dodon Ray, a concentrated energy blast designed to pierce and kill opponents instantly. He is also credited with teaching Tenshinhan the Tri-Beam, a powerful but life-risking energy technique that unleashes a massive blast at the cost of the user's life force. Additionally, Crane possesses the ability of telepathy, allowing him to communicate mentally with his targets, which he uses to give instructions to his students during battle. Despite his age and frail appearance, he is a dangerous strategist and a cunning combatant, but his actual combat prowess is notably inferior to that of his brother Tao and his former student Tenshinhan. He relies more on cunning and manipulation than on direct physical confrontation, and his role in the story ultimately diminishes as the series shifts toward higher-powered threats that far exceed his capabilities.