the movies and comics are not completely the same company, which means that even through they're parts of the same massive beast, there are still rights issues to translating a character to a different media.
What was the deal when Smallville's Chloe joined Action Comics for all of 5 minutes?
I miss her.
I love her.
Season 3 of Wilfred starts in June, and god help me if Allison isn't still associated with the cast and production.