A synopsis has been shared for each episode of Elseworlds, the Arrowverse crossover that will bring together the stars of Arrow, The Flash and Supergirl next month. This provides our best impression yet of what the story entails.

The crossover carnage will kick off on December 9th, for American viewers, with The Flash season 5 episode 9. It’s been summed up thusly:

“EPIC ELSEWORLDS CROSSOVER KICKS OFF TONIGHT — When Barry Allen (Grant Gustin) and Oliver Queen (guest star Stephen Amell) wake up one morning and realize they have swapped bodies with each other, the two set off to find out what disturbed the timeline to cause such a shift. However, things quickly go from bad to worse when they present their case to Team Flash and the gang doesn’t believe them. Barry and Oliver realize they need Supergirl’s (guest star Melissa Benoist) help and travel to Smallville on Earth-38 where they end up meeting Kara’s cousin, Clark Kent (guest star Tyler Hoechlin), and intrepid reporter, Lois Lane (guest star Elizabeth Tulloch). LaMonica Garrett guest stars as The Monitor. Kevin Tancharoen directed the episode written by Eric Wallace & Sam Chalsen (#509).”

Then, on December 10th, Arrow season 7 episode 9 will continue the party:

“THE ELSEWORLDS CROSSOVER CONTINUES IN GOTHAM CITY WITH BATWOMAN (RUBY ROSE) — With Oliver (Stephen Amell) and Barry (guest star Grant Gustin) still stuck in the other’s bodies, the two get a lead on John Deegan (guest star Jeremy Davies) and head to Gotham City with Supergirl (guest star Melissa Benoist) to figure out why their reality has changed. While there, they meet the mysterious Kate Kane (guest star Ruby Rose) who provides them with information that leads the group to Arkham Asylum. James Bamford directed the episode with teleplay by Marc Guggenheim and story by Caroline Dries (#709).”

And finally, Supergirl season 4 episode 9 will wrap things up on December 11th:

“THE BATTLE CONCLUDES — 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).”

Lots to mull over, then! And no clues as to which episode John Wesley Shipp’s 1990s Flash will show up in.

UK viewers traditionally get the Arrowverse shows a week later than their American premiere, with Sky One broadcasting the shows on this side of the pond.

We’ll keep you posted as we hear more news.