On Day 2 of PaleyFest at the Dolby Theatre featuring the superheroes behind the CW’s superhero franchises,*Legends Of Tomorrow*and*Arrow*EP Marc Guggenheim teased a surprise crossover in the penultimate episode of Legends’ fifth season. While not able to name upcoming episodes based on particular comics, Guggenheim nonetheless hinted at a sizable cameo to come. “I will call it a surprise crossover. No one knows this because we've kept it under wraps, but there's a…

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