Childhood.

That and the characters introduced in the special, such as Hermey, Yukon Cornelius, and Clarice, all vanish in later specials, even in Shiny New Year which supposedly takes place immediately after the original story!

People like to put all the Rankin Bass movies in one big cinematic universe, but I like to exclude the original Rudolph from mine (while keeping its sequels, mind you) because this Santa is so different from the “official” Rankin-Bass Santa voiced by Mickey Rooney (and sometimes Paul Frees)

So am I

I’m guessing those five are:
- WB (film studio and maybe streaming)
- Discovery (linear networks)
- DC (comics)
- WB Games
- And the fifth one is either HBO (like Lionsgate spinning off Starz) or Cartoon Network (including WB’s animation library as well as the brands of channels)?