We are not sure of the release date for Heatstroke. It was released at the box office on 2008-05-31 so we estimate it was released to DVD in August 2008.

Heatstroke on IMDb

Director: Andrew Prowse

Cast: D. B. Sweeney, Danica McKellar, Chris Cleveland, Kelly Rice, and Zac Heileson

An ex-model teams up with a soldier to thwart aliens who are propelling global warming to make Earth habitable for their species