This episode holds a special place in my heart, as it is the first full-length Simpsons episode. In the episode, it is Christmas and Bart gets a tattoo. Marge spends all the Christmas money removing it, which is even worse when Homer finds out that workers at the Power Plant will not get Christmas bonuses. Homer decides to work as a department store Santa to get money, but he only gets 13 dollars. Bart and Homer go to the dog track, where they bet on a dog called Santa's Little Helper. The dog loses the race, and is abandoned by his owner, so the Simpsons take him in.
This was a heartwarming and funny episode which had very good jokes. The funniest parts were the montage of Homer being a department store Santa, the song at the end, and the Christmas assembly at the start.
It is not the best episode though, as there are some errors in the animation (Barney has yellow hair), Homer hasn't got his voice completely right yet, and it is not as consistently funny as some other episodes. But, errors aside, it is an amazing episode which you must watch.