Stephen Colbert Books 'The Office' Gig And More Casting News

Stephen Colbert is heading to "The Office."

According to EW, Colbert will guest star on the NBC sitcom as Broccoli Rob, a member of Andy's (Ed Helms) Cornell a capella group. Look for Colbert to pop up in the Halloween episode (Thurs., Oct. 25).

Colbert is just the latest "The Daily Show" veteran to pop up on "The Office." Both Helms and former "Office" boss Steve Carell are "Daily Show" veterans. Colbert's non-"Colbert Report" credits include "Strangers With Candy," "Law & Order: Criminal Intent" and voice work on "Saturday Night Live."

In other casting news ...

"The Artist" actress Missi Pyle will guest star on "1600 Penn." Pyle will play a Secret Service agent in the NBC comedy. [TV Guide]

"Greek" actor Jake McDorman will guest star on "Shameless." McDorman will play Mike, Fiona's boss. [THR]

"Buffy the Vampire Slayer" actor Ken Lerner will guest on "The Big Bang Theory." Lerner will play a love interest for Mrs. Wolowitz. [THR]

"Bones" actor Andrew Leeds will guest on "Grey's Anatomy." Leeds will not be playing a doctor, but little else is known about his character. [TVLine]