Hey, maybe someone will look at this thread and listen to my plight...
Wikipedia has some conflicting episode listings. For season three:
http://en.wikipedia.org/wiki/Teenage...03%29_Season_3
...it lists "The Christmas Aliens" as the 13th episode of season 3, but everywhere else I've seen it listed as the first. Is there any kind of validity to the list linked above? It links to the season 3 page on ninjaturtles.com and it's still there and has the same episode order as shown here.
I'm guessing 53 is the production number for the episode, while ninjaturtles.com lists it as 65, the sixty-fifth episode aired.