‘The Flash’ 5 minute extended trailer shows an ‘Arrow’ crossover plus a whole lot more

It was really no secret that the world of The Flash would intertwine with the world of Arrow, but this five-minute extended trailer really digs deep with the details. In fact, it appears that the very first episode of The Flash will be just the first time this happens. Watch and learn how Barry Allen (The Flash) got his powers, then see Oliver Queen (Green Arrow) give Barry a few tips following his discovery of his new-found superpowers.

Related: The Flash shows off for Green Arrow in first trailer for the upcoming show