|Stars||:|| Ruby Rose (Kate Kane / Batwoman), , Rachel Skarsten (Alice / Beth Kane), , Meagan Tandy (Sophie Moore), , Nicole Kang (Mary Hamilton), , Dougray Scott (Jacob Kane), , Camrus Johnson (Luke Fox), |
|Overview||:|| The group uses Ray's invention to track new recruits to help save the universe. The Monitor sends Iris, Clark and Lois in search of a mysterious Kryptonian, while Kate and Kara head out to find Bruce Wayne. In addition, Mia challenges Sara, Rory discovers a hidden talent, and Lex Luthor returns.
This crossover begins on Supergirl S5E09, and continues on The Flash S6E09, Arrow S8E08, and Legends of Tomorrow S05E01.|