Mark your calendars now! The CW's 2017 four-way superhero crossover will air across two nights this November, as opposed to four last year.

The CW is at the TCAs today, and they announced the first night of the crossover will be Monday, November 27, with "Supergirl" paired with "Arrow" -- which means "Arrow" will move to Monday just for the special event. The crossover ends the next night with "The Flash" and "DC's Legends of Tomorrow."

Here's a mini cheat sheet:

  • Monday, Nov. 27 ("Supergirl" and "Arrow")

  • Tuesday, Nov. 28 ("The Flash" and "Legends of Tomorrow")

Last year, the four shows crossed paths to battle the Dominators, across four nights. However, some fans complained that it wasn't really a four-way crossover because the storytelling didn't actually take place across all four shows. The action mostly focused on "The Flash," "Arrow," and "Legends," with one epilogue scene for "Supergirl." Back in Feburary, executive producer Andrew Kreisberg said they were "hoping to do a true four-way crossover" this time.

This week, when addressing the change to two nights, The CW president Mark Pedowitz said (via Deadline), "Last year's (crossover) was the most successful week in CW history in terms of ratings and everything. We felt in this particular case we had Flash on Legends paired, so it was better to make it two two-hour movies -- a miniseries. We thought this was the best way to go. We had a lot of conversations with producers and marketing people. Next year, we might go back to four nights."

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