The Flash
Official poster of The Flash The CW

Arrow's spinoff show The Flash premieres on Tuesday, October 8 on the CW

The pilot episode is titled City Of Heroes, and the episode will show us the transformation of Barry Allen (Grant Gustin) from a CSI investigator to The Flash.

The premiere episode synopsis reads:

Arrow- Flash Crossover

Flash- Arrow crossover
Barry Allen/The Flash (Grant Gustin) and Oliver Queen/ Arrow (Stephen Amell ) pose together. The CW

A new teaser released by The CW features Stephen Amell as Arrow in it, and centres on the conversation he has with Barry about establishing himself as a superhero identity, The Flash. Arrow advices The Flash about "making a difference, saving people."

Watch the teaser here.

Stephen Amell recently teased the crossover between his Oliver Queen and Grant Gustin's Barry Allen on Twitter.

He tweeted:

Grant Gustin also posted a picture of the Arrow-Flash crossover filming in Vancouver.

He wrote: "We got got during rehearsal today & the shot is pretty awesome. @amelladventures @james2bambamford@jonkralt"

The CW has also released an extended five-minute trailer for The Flash.