Son of Yuga Khan and Heggra, Darkseid is the ruler of the planet Apokolips, a post he obtained after assassinating his mother. He is obsessed with finding the Anti-Life Equation in order to use it to rule the universe; this goal also includes conquering his rival planet, New Genesis, ruled by the Highfather. A destructive war between the two worlds was stopped only with a diplomatic exchange of the sons of Highfather and Darkseid. Darkseid\\'s son Orion is surrendered to the Highfather while Darkseid receives Scott Free, who later becomes the master escape artist Mister Miracle. This turns out to be a setback for Darkseid with his biological son growing up to value and defend the ideals of New Genesis in opposition to his father. Darkseid was one of the featured villains in the (non-continuity) crossover of the Teen Titans and Marvel Comics' X-Men. Like most crossovers between Marvel and DC, there was a Marvel villain in addition to the DC villain - in this case, Dark Phoenix and (something unusual) another DC villain also appeared: Deathstroke the Terminator (since Darkseid was not a well-known villain for the heroes at the time the comic was launched). In the DC/Marvel crossover, Darkseid's counterpart in the Marvel Universe was shown to be Thanos.
Apart from that very cool.