"Casshan is an android — the union of Rolando Valdez III's consciousness with an invincible body. His body features a number of unique android functions, including superhuman speed, agility and strength."

Casshan battles Braiking Boss and the Robot Army that plan to enslave humanity. Braiking Boss's spirit is invincible, like Casshan's body and he infests all of the opponents in which Casshan does battle with. Each new match is another encounter with Braiking Boss and the forces of the robot army, just in a different form. Casshan works tirelessly to master his martial arts and combat abilities to make sure that evil may never take command of the world. Whether the individual battle ends in victory or defeat for Casshan, the war is never over and the forces of evil will never vanquish the good that he represents.