Charlie has been diagnosed with a readily treated cancer, Hodgkin lymphoma, but decides to try alternative therapies such as coffee enemas and homeopathy.
[2] His friends, Tess and recently divorced Joel, lock him in a cellar and inject him with chemotherapy drugs against his will.
[3] Tess and Joel take desperate measures to cover up their scheme, prevent Charlie escaping, and mislead his wife, Kira.
[4] The series was commissioned by BBC3, written by Sam Bain, directed by Steve Bendelack, and produced by Fudge Park Productions.
[1][4] Ill Behaviour received mixed reviews from critics, scoring 55 on Metacritic and 67 per cent on Rotten Tomatoes as of 2023.