The Flash Season 1 Episode 17

A copycat killer who goes by the name “The Trickster” starts setting off bombs in Central City. In order to stop the villain, Barry and Joe meet with the original Trickster, a criminal mastermind named James Jesse, who has been imprisoned for 20 years. Things quickly go from bad to worse when the Tricksters unite and take Henry Allen prisoner. Meanwhile, Iris asks Eddie for help with a case, and flashbacks show how Eobard Thawne came up with the idea for the particle accelerator.