The Flash (2014) Season 4 Episode 16
Team Flash confront a new bus meta, Matthew aka Melting Pot. He has the ability to swap people’s DNA, so during a battle with Team Flash, he transfers Barry’s super speed to Iris. Now, with a new threat unleashed on Central City, Barry must act as the team leader while Iris takes on the mantle of superhero speedster in order to defeat their new foe.
Serie: The Flash (2014)
Episode Title: Run, Iris, Run
Air Date: 2018-03-13