"Interstellar" stars Matthew McConaughey and Anne Hathaway reunited for a very different kind of one-word movie in "Serenity."

Instead of astronauts, they play ex-spouses -- and she asks him to kill her current husband (Jason Clarke) and frame it as an accident.

Just drop him in the ocean and let the sharks take him out. No prob, right?

The first "Serenity" trailer was just released, with so much classic McConaughey whispering you almost expect it to segue into a Lincoln commercial:Here's the full synopsis:

"From the creative mind of Oscar nominee Steven Knight comes a daringly original, sexy, stylized thriller. Baker Dill (Academy Award winner Matthew McConaughey) is a fishing boat captain leading tours off a tranquil, tropical enclave called Plymouth Island. His quiet life is shattered, however, when his ex-wife Karen (Academy Award winner Anne Hathaway) tracks him down with a desperate plea for help. She begs Dill to save her – and their young son – from her new, violent husband (Jason Clarke) by taking him out to sea on a fishing excursion, only to throw him to the sharks and leave him for dead. Karen's appearance thrusts Dill back into a life he'd tried to forget, and as he struggles between right and wrong, his world is plunged into a new reality that may not be all that it seems."

"Serenity" also stars Djimon Hounsou, Jeremy Strong, and Diane Lane. You can't get your "Serenity" now -- sorry, Kramer -- but the film opens in theaters on October 19.

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