David Boreanaz wasn't afraid to say exactly what he thought of "Castle" star Nathan Fillion during the "Bones" San Diego Comic-Con panel on Friday.

After seeing that "Castle" was featured on the back of a TV Guide issue that had "Bones" on the front, Boreanaz began mocking Fillion for halting production because of a contract dispute.

"I want to work four days, not five," Boreanaz joked.

In less tense "Bones" news, creator Hart Hanson promised Comic-Con goers that Season 9 would see Booth (Boreanaz) and Brennan (Emily Deschanel) tie the knot.

“We’re not fooling you — they will get married this season,” Hanson said, according to TVLine.

"Bones" and "Castle" will return to Fox and ABC in the fall.

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  • 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.