Crossover Part 1.
The Flash, Arrow, Supergirl Crossover.
Elseworlds Part 1 – The Flash.
When Barry Allen (Grant Gustin) and Oliver Queen (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 (Melissa Benoist) help and travel to Smallville on Earth-38 where they end up meeting Kara’s cousin, Clark Kent (Tyler Hoechlin), and intrepid reporter, Lois Lane (Elizabeth Tulloch). LaMonica Garrett guest stars as The Monitor. Kevin Tancharoen directed the episode written by Eric Wallace & Sam Chalsen (#509).
Director: Kevin Tancharoen.
Barry and Oliver wake up in each other’s bodies.
Kara and swapped Oliver and Barry visit Clark and Lois on Earth 38’s Kent Farm in Smallville.
Kara, swapped Oliver & Barry and Clark & Lois on the Kent Farm.
Barry as Oliver Queen with the Arrow’s skills on the Kent Farm.
Swapped Oliver & Barry suit up as The Flash & Green Arrow in Central City on Earth 1.
Stephen Amell as The Flash, Grant Gustin as Green Arrow, Melissa Benoist as Supergirl and Tyler Hoechlin as Superman in downtown Vancouver.
The annual DC crossover on The CW is flipping the order: it starts with The Flash on Sunday, December 9th, followed by Arrow on Monday, December 10th and ends with Supergirl on Tuesday, December 11th — all at 8 p.m.