The Light Star, first appearing in MarioMario54321's Super Mario 64 Bloopers series OiramOiram12345 and the Dark Star X, was created by the Light Star X (similar to how the Dark Star X created the Dark Star) as a counterpart to the Dark Star. In this same series, Geminon gave it to Mario in order to revive his friends who were killed by the Dark Star X in Dimension X.
Advertisement