Shiny news, "Community" fans -- Nathan Fillion is set to guest star in the NBC comedy's upcoming Season 5, according to Deadline.

The "Castle" and "Firefly" star -- who visited the set last year as a fan -- will play Bob Waite, "the politically savvy head custodian who’s not afraid to get his hands dirty but is smart enough to wear rubber gloves." Annie (Alison Brie) and Professor Hickey (guest star Jonathan Banks) will encounter Fillion's character when they team up to "navigate Greendale's corridors of power," Deadline reports.

Will Fillion's cult fanbase give "Community" a ratings boost? That would be cool, cool, cool.

Fillion's "Castle" currently airs Mondays at 10 p.m. ET on ABC. "Community" will return to NBC midseason.

Loading Slideshow...
  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle 100th Episode

  • Castle Season 5

    Stana Katic as NYPD Detective Kate Beckett.

  • Castle Season 5

    Seamus Dever as NYPD Detective Kevin Ryan.

  • Castle Season 5

    Penny Johnson Jerald as NYPD Captain Victoria Gates.

  • Castle Season 5

    Jon Huertas as NYPD Detective Javier Esposito.

  • Castle Season 5

    Molly Quinn as Alexis Castle.

  • Castle Season 5

    Nathan Fillion as Richard Castle.

  • Castle Season 5

    Susan Sullivan as Martha Rodgers.

  • Castle Season 5

    Tamala Jones as Medical Examiner Lanie Parish.

  • Castle Season 5

    "Castle" stars Jon Huertas as NYPD Detective Javier Esposito, Tamala Jones as Medical Examiner Lanie Parish, Seamus Dever as NYPD Detective Kevin Ryan, Molly Quinn as Alexis Castle, Susan Sullivan as Martha Rodgers, Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett and Penny Johnson Jerald as NYPD Captain Victoria Gates.