Devil
From Memory Alpha, the free Star Trek reference
The devil (also known as Satan or Lucifer) is a malevolent entity from Christianity as depicted in the Bible.
When Khan was exiled to Ceti Alpha V by James T. Kirk, he referred to a passage from Milton's poetic dramatization of the story of the Devil's fall from grace, Paradise Lost, in which the Devil states that it is "better to rule in Hell than serve in Heaven." (TOS: "Space Seed")
Lucien, an inhabitant of Megas-Tu during the 23rd century, had once lived on Earth, where he was known by the name Lucifer with his appearance becoming the basis for the Christian depiction of the Devil. (TAS: "The Magicks of Megas-Tu") Other religious characters resembling the biblical Devil were Fek'lhr and Ardra.
On Omega IV, an entity known as the Evil One was cast in the same light as the Devil. Captain Ronald Tracey, in violation of the Prime Directive, tried to trick the Yangs into thinking that Spock was the Evil One. (TOS: "The Omega Glory")
While demonstrating her abilities to Captain Picard and Lieutenant Worf, the impostor posing as Ardra also turned into the Devil and Fek'lhr. (TNG: "Devil's Due")
In 2369 after Vedek Winn Adami accused Commander Benjamin Sisko and the Federation to live in a dark universe in which they want to drag the spiritual Bajorans into, Sisko replied that the Bajorans who lived and worked with the Federation officers aboard the station for months could proove that they are not the devil. (DS9: "In the Hands of the Prophets")
