Executive Producers Robert Rovner, Beth Schwartz and Marc Guggenheim talk about the latest episode of Supergirl.
Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin), Green Arrow (guest star Stephen Amell) and Superman (guest star Tyler Hoechlin) engage in the battle of their lives.
Jesse Warn directed the episode with story by Marc Guggenheim and teleplay by Derek Simon & Robert Rovner (#409). The episode airs on December 11, 2018.
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