Episode 21

"The Strongest Troubles" is the twenty first episode of the One-Punch Man anime series and ninth episode of season two.

Trivia

 * This episode should have aired on June 4th, 2019 but was delayed by one week due to the French Open 2019, a tennis competition, being scheduled at the same time.https://twitter.com/opm_anime/status/1135710483384655872