p It's about to get really dark up in here.

The first trailer for Stephen King's "The Dark Tower," starring Idris Elba (as Roland Deschain, the gunslinger) and Matthew McConaughey (as Walter Padick, the man in black), will be released on Wednesday.

The stars just couldn't wait to share some snippets.

First, the two had a little in-character back-and-forth on Twitter dot com.

And then, the video clips -- much appreciated, considering how little from the film has been shown to date.

"The Dark Tower" comes out Aug. 4 in the US, Aug. 17 in Australia and Aug. 18 in the UK.

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