Khan Noonien Singh is a fictional character from the Star Trek franchise, first appearing in the original series episode "Space Seed." He is a genetically engineered superhuman, created in the late 20th century, who possesses enhanced strength, intelligence, and charisma. Khan is portrayed by actor Ricardo Montalbán and is known for his ambition and desire for power. Khan becomes a significant antagonist in the Star Trek universe, particularly in the film Star Trek II: The Wrath of Khan. In this film, he seeks revenge against Captain James T. Kirk for his past defeat and the loss of his crew. Khan's character explores themes of ambition, vengeance, and the consequences of genetic engineering.