Dr. Wellington Yueh graduated as a medical doctor from the Suk School and served the House Atreides as their family physician. Due to the Imperial Conditioning of Suk doctors, Yueh was thought to be entirely lacking in the ability to bring death or harm upon anyone, and therefore unable to betray House Atreides. Quiet, empathetic, and sensitive, Yueh is an unwilling villain and a deeply tragic character. He betrays the Duke Leto in an attempt to save his wife Wanna, a Bene Gesserit, from ongoing torture at the hands of the Harkonnens. However, despite working with the Harkonnens to devise a plan of attack, Yueh does his best to equip both the Duke Leto and his family with tools to fight back or escape. He gives the Duke Leto a poison tooth to bite in the Baron’s presence, in the hopes that he might take the Baron and his cronies with him into death.

He also orchestrates Jessica and Paul’s escape by providing them with the necessary resources to fight off and flee their attackers, which includes a desert survival pack stocked with stillsuits. Even in his betrayal, he maintains some loyalty to the Atreides family.

Yueh is highly aware of how his actions will impact his future legacy. His efforts to help Paul and Jessica are done partly to save a sliver of his reputation – he doesn’t want to be seen as a cold-hearted traitor. Yueh’s struggle between his loyalty to House Atreides and his loyalty to his wife brings him much sadness and pain. His personality is not villainous or violent, but his hand is forced by the merciless Harkonnens. Once he fulfills their purposes, they quickly dispatch him, exhibiting how human beings’ lives and pain are merely tools for House Harkonnen to use to their advantage. In the world of Dune, which is rich with many religious allusions, Yueh functions as a Judas Iscariot character. His betrayal of the Duke Leto seems almost inevitable – an act fated by destiny. He doesn’t truly wish to betray the House Atreides, but is convinced to do so by corrupting outside influences.

The aftermath of the betrayal quickly leads to his death. He gains almost nothing from his actions except for the confirmation of Wanna’s death and the end of her suffering. His character is tragic in that he functions as a helpless pawn moved by the forces of a great, universal plan, which demands him to take on the undesirable and shameful role of traitor.