A Fairly Odd Christmas plot
A few days before Christmas, Santa Claus is trying to figure out who has been good or naughty. But he realizes that because Timmy already grants wishes to others, their names have been removed from the list. Santa brings Timmy to his workshop and explains that he doesn't want Timmy to grant any more wishes. At the same time, an elf tells them that the gift wrapping machine is broken. When Santa wishes for a repair, Timmy decides to fulfill it. But because the magic of fairies doesn't work in the workshop, there is a big bang. This causes Santa to fall into the machine and cause brain damage. Now Timmy has to fill in for Santa Claus.