CBS | 8:00 pm

A very reluctant McGee (Sean Murray) is forced to return to his high school for an investigation after a decidedly unique computer password he created and used back during his teenage years is linked to a murder in the new episode "Once Upon a Tim." The victim was a Department of Defense contractor, and the case escalates further when an intruder breaks into McGee’s home, hoping to steal his vintage high-school computer. Margo Harshman and Matthew Glave guest star.