Darth Kalen was a Sith Lord during the Galactic Civil War. He felt that Darth Sidious was unsuitable to rule the Sith due to the fact that Sidious had not revealed to the public that he truly was a Sith. Therefore, Kalen planned to overthrow the Dark Lord using what he felt was a merciless Sith Empire. Using mainly leftovers from the Clone Wars for his army, he was not considered a true threat to the Galactic Empire. He would die at the hands of Darth Vader, on his flagship, the Ravager.