BEGIN SLIDESHOW New Supergirl poster shows Mon-El fully suited up Just a few days before the next episode of Supergirl, The CW has released a new poster of lead character Mon-El in his red suit from the comics! Check it out in the gallery below. The new episode, which is entitled “In Search of Lost Time,” is set to air on April 23 and is described as follows: “J’ONN HAS TO FACE THE TRUTH ABOUT HIS FATHER — When Myr’nn (guest star Carl Lumbly) inadvertently causes psychic disturbances at the DEO, Supergirl (Melissa Benoist) must work with J’onn (David Harewood) to contain the resulting chaos.