On her final day before maternity leave, Dr Terra undertakes what she hopes is her final routine operation. While packing up her desk, the intercom chimes calling her back to the theatre. Alongside her team, Dr Terra begins to discover that all of their patients have increasing amounts of plastic hidden within their bodies. Quickly overwhelmed with the scale of infected patients, they attempt to save as many people as they can until they themselves start showing signs of infection. Dr Terra is left to make the impossible decision, save herself or her patients.