Stephen Colbert to Guest Star On <i>The Office</i> Halloween Episode

Prepare yourselves for one of the greatest reunions of all time. That's right, on the final Halloween episode of NBC's The Office, we'll see two titans reunited: Andy "Nard Dog" Bernard and Broccoli Rob of Here Comes Treble. Better yet? According to Inside TV, Stephen Colbert is set to play Rob.

While Andy Bernard (Ed Helms) has spoken about his fellow Cornell a cappella singer Rob several times, he has yet to make an appearance on the show. But in the Oct. 25 episode, Bernard finds out that Rob has been spreading some potential lies about their shared musical past, bringing them together again. Expect plenty of singing from the two, who are Daily Show alums, we're hoping for a sing-off of sorts.

The ninth and final season of NBC's hit sitcom premiered last night. According to creator Greg Daniels, who returned to see the series end, the final episodes will not only answer many questions but show where plenty of the characters wind up.

The Office airs Thursdays at 9 p.m. ET/PT.

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