Gil Grissom is back on CSI! ... as a Guest and in Skype

The long awaited guesting of William Petersen on CSI: Crime Scene Investigation will be shown on the show episode entitled "The Two Mrs. Grissoms" to which the focus of the episode will be the relationship of between Grissom's mother and his wife Sara Siddlle-Grissom. If you don't believed me here's a sneak peek of the episode (Warning: Spoiler Alert)