(originally titled "Cause and Effect") is the 21st episode of the third season of The Flash (2014). It is known for its tonal shift from the season's darker themes to a more lighthearted "amnesia plot". Plot Overview
The two share a kiss that helps Tracy finalize the design for the "Speed Force Bazooka". Episode Details Season/Episode: Season 3, Episode 21 Original Air Date: May 9, 2017 Writers: Judalina Neira & Lauren Certo Director: David McWhirter
Following the reveal that the villain is a time remnant of Barry Allen, Team Flash attempts to stop him by preventing Barry from forming new memories. Their logic is that since Savitar is a future version of Barry, he remembers everything Barry does.
The plan goes awry, causing Barry to lose his entire memory. He begins going by the name "Bart" .
