Who is Supergirl's trans superhero Dreamer – and why is her arrival so important?

Plenty had changed for Supergirl by the end of its third season. After Reign was defeated, Chris Wood’s Mon-El was sent back to the future and series regular Jeremy Jordan was downgraded to a recurring role. The Maid of Steel won’t have much time to recover from these losses though as new threats are on the horizon. N
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