By Sandra Gonzalez
Updated August 29, 2013 at 07:57 PM EDT
Rebecca Sapp/WireImage

Updated: The Crazy Ones has booked its latest guest star with golden pipes.

EW has learned exclusively that mega singer Josh Groban will appear the sixth episode of the CBS comedy’s freshman season. But unlike Kelly Clarkson, who appears in the pilot as herself, Groban plays a guy named Richie who is a friend from Sydney’s (Sarah Michelle Gellar’s) past, who comes back into her life to repay a kindness. The problem? Sydney completely misperceives his intentions, and Simon (Robin Williams) intercedes to right the ship.”In doing so, he gets an idea from Richie that lands a big account for the firm,” according to casting scoop.

This is far from Groban’s first time on the TV block. He’s previously guest-starred on Glee, The Office, and CSI: NY.

The Crazy Ones, which stars Gellar and Williams as a father-daughter ad exec team, premieres Sept. 26 at 9 p.m. ET. Watch a sneak peek of the show below.