On this week's Across the Airwaves DC Nation, Nico and Michael cover the latest episodes of Supergirl, The Flash, and Arrow before their big three week hiatus for April, as well as the penultimate episode of this season of DC's Legends of Tomorrow. Some great discussion on Supergirl and Flash big bads, Arrow finale predictions, and an in depth look at Heatwave as well as some talk on the alternate reality of Doomworld on this week's Legends discussion. All this and more on this week's DC Nation Podcast! DC Headlines  Arrow: Katie Cassidy to Return as Series Regular for Season 6 Joss Whedon in Talks to Write, Direct, Produce Batgirl Film Joss Whedon’s Batgirl movie will be based on The New 52 comics Jessica Chastain is open to playing Poison Ivy in ‘Gotham City Sirens’ First Look: Black Lightning Suits Up Arrow: Who Is Vigilante Nicole Kidman confirms she’ll play Aquaman’s mom TV Shows Reviewed on this Week's Podcast Supergirl: S02E17 "Distant Sun" The Flash: S03E18 "Abra Kadabra" Arrow: S05E18 "Disbanded" DC Legends of Tomorrow: S02E16 "Doomworld"