'CSI' books Mark-Paul Gosselaar for two roles in Season 15: Twins!

mark-paul-gosselaar-csi-twins-murderer.jpgNo, you haven't taken too many caffeine pills: There will be two versions of Mark-Paul Gosselaar when he recurs as a pair of twins on "CSI" this fall. You should be excited and scared to know that one of the two is a murderer on death row, and the other's a model citizen.

According to Entertainment Weekly, the "Franklin & Bash" star (and "Saved By the Bell" vet) has booked an arc on "CSI" playing twins named Jared Briscoe and Paul Winthrop -- one of whom is about to be executed for murder and the other who is "a real estate magnate and a pillar of the community who insists on his brother's innocence.'

"CSI: Crime Scene Investigation" returns for its 15th season on Sunday, Sept. 28 on CBS.

Photo/Video credit: Getty Images