Noob Saibot, once known as Bi-Han (璧漢 or 避寒) and the original Sub-Zero, was a Lin Kuei assassin turned wraith from the Mortal Kombat fighting games series. He is one of the few original characters, debuting in the original Mortal Kombat arcade game as Sub-Zero, older brother of the current, younger Sub-Zero. He first appeared as Noob Saibot as a secret character in Mortal Kombat II, first becoming playable in Ultimate Mortal Kombat 3, and was once again a secret character in Mortal Kombat 4. In one form or another, Noob Saibot has appeared in every generation of Mortal Kombat games as a playable character.