[s4e25] The Critic In The Cabernet -

: David Boreanaz previously made a cameo in Family Guy , and Stewie's appearance in Bones was considered a creative "exchange" between the shows.

: Brennan's father, played by Ryan O'Neal, makes an appearance as Brennan discusses her parenting plans. [S4E25] The Critic in the Cabernet

: Parallel to the case, Brennan decides she wants to have a child and asks Booth to be her sperm donor. This request forces both characters to confront unspoken feelings and the potential of a shared future. : David Boreanaz previously made a cameo in