'Gravity Falls' video: 'Castle's' Nathan Fillion guest stars as Preston Northwest

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In the strange world of "Gravity Falls," the animated Disney XD show, a guest starring role for "Castle" actor Nathan Fillion seems to fit. Watch a clip of the upcoming episode, "The Golf War," to hear Fillion in the role of Preston Northwest.

According to TVGuide.com, Preston is the wealthy and distant father of Pacifica Northwest, the rival of heroine Mabel Pines. Competition grows when the two girls play each other in a high-stakes game of mini golf.

This "Gravity Falls" episode, "The Golf War" airs Monday, Aug. 11 at 9:30 p.m. ET/PT on Disney XD.

Photo/Video credit: Disney XD