From the Super Mario Wiki
“Ehee hee hee! So you're after it too? Well, you'll have to race me for it!”
—Spooky Speedster, Super Mario Galaxy
The Spooky Speedster is a character from Super Mario Galaxy. He is a Boo wearing a helmet and a visor, and he challenges Mario to a race for a Power Star.
Mario first meets him in Ghostly Galaxy, in which he must use Pull Stars to navigate through the track. He meets him again in the Boo's Boneyard Galaxy. Here, Mario must turn into Boo Mario and race through a tunnel. When Mario meets the Spooky Speedster, he calls the Power Star "it", assuming Mario is also after "it". If Mario reaches the finish area first, the Spooky Speedster gives him the Power Star. However, if Spooky Speedster gets to the Power Star first, Mario will lose a life.
Along with Cosmic Mario, he is a rough equivalent to Koopa the Quick and Il Piantissimo. When he starts a race he will pull his visor down over his eyes.
Super Mario Galaxy Trading Card Description
Mario encounters this restless spirit deep in the Ghostly Galaxy. Spooky Speedster is a Boo that challenges Mario to a race through the cosmos for a Power Star. Mario must use Pull Stars to navigate the creepy, bone-ridden course. If he beats him, Spooky will graciously award the celestial prize.
- The Spooky Speedster resembles a Boo on Daisy's team with a helmet from Mario Strikers Charged.
- Oddly, Spooky Speedster says he's racing for the Power Star, yet when Mario wins, he appears to already have it.