New THOROUGHBREDS Trailer Check out the new THOROUGHBREDS trailer! The film, written and directed by Cory Finley, stars Anya Taylor-Joy, Anton Yelchin, and Olivia Cooke. THOROUGHBREDS will be released in theaters on March 9, 2018. Two upper-class teenage girls in suburban Connecticut rekindle their unlikely friendship after years of growing apart. Together, they hatch a plan to solve both of their problems-no matter what the cost.