BEGIN SLIDESHOW New Supergirl photos tease an attack by Pestilence Ahead of next week’s new episode, The CW has released the first batch of photos for the following episode of Supergirl! Check them out in the gallery below! RELATED: New Supergirl Promo: In Search of Lost Time Titled “Of Two Minds” and set to air April 30, the episode is officially described as follows: “SUPERGIRL AND IMRA MUST WORK TOGETHER TO STOP THE THIRD WORLDKILLER – Supergirl (Melissa Benoist) and Imra (guest star Amy Jackson) have different ideas on how to stop the third Worldkiller, Pestilence.