'CSI' scoop: Mark-Paul Gosselaar taking on devious double role

Mark-Paul Gosselaar will play a notorious serial killer on CSI this fall.

Mark-Paul Gosselaar will also not play a notorious serial killer on CSI this fall.

Confused? Here’s the deal: EW can exclusively reveal that the Franklin & Bash star (who, let’s face it, you still know best as Zack Morris on Saved By the Bell) has booked an arc on CBS’s venerable procedural—and that he’ll be playing twins named JAred Briscoe and Paul Wintrhop. One of the brothers is an unrepentant murderer about to be executed for his crimes; the other, according to CBS, is “a real estate magnate and a pillar of the community who insists on his brother’s innocence.” Neither, presumably, has a cell phone that looks like this.

The fifteenth season of CSI: Crime Scene Investigation premieres Sunday, Sept. 28 on CBS.