There's a new demon in Sunnydale, and he wont allow the Slayer to stand in his way

When Xander dressed as a biker, he ended up becoming Johnny Blaze for that night. After the spell ended, the Rider seemed to disappear until the night Kendra was killed.

Xander meets a flaming skeleton on a flaming bike during patrol. btvsGR xover. This will be slash. eventually. Hiatus due to writer's block.

To the world, Xander Harris was the Zeppo, the left behind of the Slayer's chosen. But at a fateful point in his life, he made a choice... a deal. Xander Harris is now the Devil's Chosen, He Who Walks In Both Worlds... The Ghost Rider.