Starragus X was originally Celestius X until the Grand X split it in two. Geminon X sealed him in a rock and was called Rocko X. He then met Mario and friends and told them that they needed to go to Ztarragus's Island X and collect the four pieces of the Grand X. When they do this and defeat Ztarragus X, Starragus X is released from his prison and gives Mario 2 minutes to beat him. After beaten, he merges with Ztarragus X to become Celestius X.