It's the Autobots versus the Decepticons, as directed by Michael Bay.

If you are in the US, you should be able to get the first live-action Transformers movie for free today in the Google Play Store. The movie was first released in 2007 and is by far the best film of this giant robots sci-fi franchise, which has now included three sequels that are, quite frankly, much worse than this entertaining flick, even if it does star Shia LaBeouf.

To be clear, this freebie is for the HD version of the Transformers movie, which normally costs $17.99. All you have to do is click on that selection to put it in your library.