Disney's 'Dog With a Blog': An Unlikely Guest Crashes the Holiday Party (Exclusive Video)

Disney Channel continues the holiday cheer with a special episode of Dog With a Blog.

In "Twas the Fight Before Christmas," airing Dec. 6 at 8:30 p.m., Avery (G. Hannelius) sets out to create the ideal Christmas in anticipation of a visit from Aunt Sigourney (guest star Cynthia Watros), her mother's competitive sister.

The Hollywood Reporter exclusively debuts a clip where you get a good introduction on the type of person Sigourney is. After taking off her shoes, Sigourney accidentally dramatically slips on "some mud" that she didn't see on the floor. "It's my own fault...for assuming there wouldn't be mud on your kitchen floor!" she exclaims as she's helped back up. "Don't worry! I'm sure you're far more humiliated than I am hurt."

While Avery's mother, Ellen (Beth Littleford), is set on ushering her sister out the door, Sigourney breaks the news that because she's thrown out her back, she'll have to stick around for a few days -- in essence, canceling her planned trip to Hawaii. How will Ellen cope? Watch the scene above.

As part of the Disney Channel's annual "Fa-la-la-lidays" programming, A.N.T. Farm and Wander Over Yonder also will broadcast holiday episodes Dec. 6.

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