Nim-El was a native of the planet, Krypton, and an esteemed member of the House of El. He was one of three sons to Jor-El the First, and the twin brother of Jor-El the Second. Like many in his family line, Nim-El pursued a career in science. He was recognized as one of the primary weapons manufacturers on Krypton. Nim-El was killed when Krypton’s core grew unstable causing the entire planet to explode.