After facing the Master Jailer in episode 14, Kara is set to face a virtual villain in "Supergirl" season 1 episode 15, as per recent spoilers.

"Supergirl" season 1 episode 15 is entitled "Solitude." According to Spoilers Guide, the episode is set to see Supergirl as she travels to Superman's Solitude Fortress to find a way to defeat Indigo (Laura Vandervoort), who can transport through the web. As per the publication, Indigo is related to Kara's past. The episode will also see James and Lucy's relationship reach a crossroads.

"Supergirl" season 1 episode 14 is entitled "Truth, Justice, and the American Way." Directed by Lexi Alexander, the episode saw Kara, Alex, and J'onn track down an armored alien called the Master Jailer, who was revealed as a prison guard at Fort Rozz. Master Jailer had become a vigilante who executes alien fugitives, along with people who were convicted of non-violent crimes like a professor who did drug smuggling.

Kara also confronted Master Jailer, but he took her instead and planned to kill her. Alex pointed his location near the prison crash site, allowing Kara to defeat Master Jailer and save the professor. While Kara remained firm against releasing Maxwell from the DEO's possession, Cat assigned Lucy and James to explore his disappearance.

Lucy and James had tensions after the latter found out the Lucy took a photo of a DEO vehicle and revealed what he knew about the organization, leading James to pursue Kara about Maxwell's release.

The previous episode also saw Kara find new CatCo assistant Siobhan Smythe as her competition, with the latter promising to turn Kara's life miserable. Kara also tried to gather information about Myriad, but she found out that she was being prevented from finding out from J'onn. The superhero discovered that J'onn killed her aunt, leader her not to forgive him.

"Supergirl" season 1 episode 15 is set to air on Feb. 29.