Somebody stop me

If it were just a movie about a thawed mammoth, I wouldn't watch it. If it were just a movie about a thawed mammoth going on a rampage in a sleepy Louisiana town, I wouldn't even be tempted. Even a movie about a thawed mammoth going on a rampage in a sleepy Louisiana town with Summer Glau wouldn't suck me in.

But it's a movie about an alien-possessed thawed mammoth going on a rampage in a sleepy Louisiana town. With Summer Glau.

Help me?

(9PM. SciFi. Mammoth.)

[Edit: Tangentially, compare this 2005 John Varley book cover to this 1999 Stephen Baxter one. Mammoth coincidence.]