The Rankin/Bass Cinematic Universe Archive Collection

21 interconnected holiday specials across two decades, forming an intricate cinematic universe with deep fantasy lore.  Kind of.
 
Rudolph the Red Nosed Reindeer
Cricket on the Hearth
Little Drummer Boy
Frosty the Snowman
Santa Claus is Coming to Town
Here Comes Peter Cottontail
The Year Without a Santa Claus
'Twas the Night Before Christmas
The First Christmas: The Story of the First Christmas Snow
Frosty's Winter Wonderland
Little Drummer Boy Book II
Rudolph's Shiny New Year
The First Easter Rabbit
Nestor, the Long-Eared Christmas Donkey
The Easter Bunny is Comin' to Town
The Stingiest Man in Town
Jack Frost
Rudolph and Frosty's Christmas in July
Pinocchio's Christmas
The Leprechaun's Christmas Gold
Life and Adventures of Santa Claus