it's a what?

The Mummy was released in the 1930s.

The Mummy was a remake of the original 30s Mummy movie. Mummy Returns was a sequel. Scorpion King was a prequel to the sequel.

In 2008, they're releasing both this direct to dvd movie and Mummy 3.

What's all that mean, in a Spaceballs kind of way?

This is a prequel of the prequel to the sequel to the remake of a 1930s movie.