Ow does the a?imagination of disastera? (Susan Sontag) function in depictions of urban catastrophe in film I Am Legent (2007)?

The essay should be based on the reading from the book. It should be applied to the film I AM Legend (2007) staring Will smith

Referencing Requirements:
This is a link to the reading: Science-Fiction-A-Collection-of-Critical-Essays
The book where Susans Sontags chapter is is called Science Fiction: the collection of critical essays