Frasier and Niles squabble over who will host Christmas festivities; Roz develops a crush on Santa Claus (Dean Cain).
When Frasier renews his feud with an upstairs neighbor (Brian Stokes Mitchell), Martin begins dating the neighbor's mother in a ploy to diffuse their rivalry.
Frasier helps Habitat for Humanity build a house and gives unwanted decorating tips to the new homeowners.
When a pathetic street singer (Elvis Costello) invades the Cafe Nervosa, Frasier and Niles are forced to find another coffeehouse.
When Frasier and Niles discover a skull at their childhood home, they try to deduce what they imagine to be a murder.