Supergirl Season 4 Episode 9
Elseworlds (III)
Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives. The crossover starts on The Flash S05E09 Elseworlds (I) and Arrow S07E09 Elseworlds (II).
Guest Stars
LaMonica Garrett
Mar Novu / The Monitor
Carlos Valdes
Cisco Ramon
Danielle Panabaker
Caitlin Snow / Killer Frost
Jeremy Davies
John Deegan
Bob Frazer
Roger Hayden / Psycho-Pirate