Supergirl Season 4 has seen a number of high-profile characters gaining superpowers through the use of Harun-El, which also played a prominent role in Season 3. A promo for the show's next episode reveals Ben Lockwood/Agent Liberty will be empowered by the substance.
Airing May 5, the episode is titled "Will The Real Miss Teschmacher Please Stand Up." The promo for the coming episode teases a fight with Eve Teschmacher, who is able to make multiple copies of herself. Agent Liberty also gets injected with Harun-El, which has previously given James Olsen and Lex Luthor superpowers. The promo shows him fighting Olsen/Guardian and Nia Nal/Dreamer
The upcoming episode will continue to deal with the fallout from Lex's plan to frame Supergirl for the murder of several people in the White House. Although that act was, in fact, committed by her doppelganger, in the style of Superman: Red Son, Kara temporarily took off her cape in a previous episode.
Airing Sundays at 8 p.m. ET/PT on The CW, Supergirl stars Melissa Benoist as Kara Danvers, David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen and Chyler Leigh as Alex Danvers.