It's Sue Snue's 11 ½ birthday, and tradition decrees that she decide what she wants to do for the rest of her life (or else eat her hat). Her four uncles want her to follow in their footsteps, but when she does, she keeps messing everything up.

Larry Nooly and his family are going to the Lodge at beautiful Lake Mulloon, the most perfectly happy place you can possibly imagine. That is, of course, until the Grinch checks in and everyone else checks out...except Larry.

Thidwick is so excited...it's his birthday, and just like every other year, the Birthday Bird will take him (and all of the other birthday celebrants) to Katroo for a huge party. But when word comes that the Birthday Bird is unable to make it this year, Thidwick decides to take charge and lead everyone to Katroo himself...disguised as the Birthday Bird!