Socks Monsters exist on Sock Planet. Sock planet is where all the socks go when the worm-hole in the dryer opens up due to build up of static electricity. Sock planet is the reason you only get 1 stocking at Christmas.
The Sock Witches are sock monster #3. They went through a magical portal that the Socerors of Old created. This picture captures one in the act of creating a sock monster. They were banished from Earth due to their use of dark magic, but not before they cast a curse on a wizard, turning him into a tree creature, StickyJoe.
The sorcerors who banished the witches did not know where the portal led.