Its very, very faithful to the comics.

I think its massively different, he says of the four-way team-up.

The first crossover we did was two separate storylines that had a slight tangential connection to each other.

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Credit: Katie Yu/The CW; Cate Cameron/The CW; Dean Buscher/The CW; Darren Michaels/Warner Bros.

This year, Guggenheim continues, were doing by far the most ambitious crossover weve ever done.

Its basically a huge three-part story that also brings in Supergirl, so its crossing over all four shows.

Its telling one big epic movie of a story.

Its not setting up any other spin-offs, its just big, bombastic, huge action.

Theres also some really poignant character moments.

Its by far the most ambitious thing weve ever attempted.

TheFlash-Arrow-Supergirl-Legends of Tomorrowcrossover is expected to kick off in November.

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ET for more on The CWs super series onSuperhero Insider, hosted byKyle Andersonandthis reporter.