The CW’s hit drama Arrow has consistently been one of the most praised superhero series on TV, not by connecting back to an ongoing universe like Agents of S.H.I.E.L.D., but simply by combining the best parts of the Green Arrow comics with a great cast and exceptional writing. And this fall, the series’ world will get much bigger with the recently picked up spinoff, The Flash.

Starring Grant Gustin, The Flash will follow CSI investigator Barry Allen, who first appeared on Arrow last winter in the episode “The Scientist” when he arrived in Starling City to solve a robbery at Queen Consolidated. Since then, the character’s already complicated life has gone from tragic – because of his mother’s mysterious murder when he was 11 – to dangerous, after a strange explosion caused him to be struck by lightning, splashed by chemicals, and left in a coma for nine months.

Barry will finally awaken this fall on The Flash as ‘The Fastest Man Alive’ in the 8pm Tuesday time slot on The CW (followed by the tenth and possibly last season of Supernatural @9pm). He’ll quickly discover that he’s not the only one that’s been changed by the accelerator explosion all those months ago, and Central City is now home to a number of ‘meta-humans’ with dangerous powers. To see what’s in store for the series, check out the first trailer and synopsis.

Many TV viewers thought The Flash would end up being paired with Arrow on the fall schedule, like many series and their spinoffs (Buffy and Angel, The Vampire Diaries and The Originals) have done throughout the years. But The CW’s decision to keep them separate might actually work in the network’s favor judging by the two series’ difference in tone. The Flash is said to be more fantastical in nature, so it might actually pair better with Supernatural than with the more grounded Arrow on Wednesdays.

But new spinoff The Flash won’t be the only change to Arrow‘s universe this fall. Stephen Amell revealed today through a tweet from The CW upfronts that John Barrowman, who plays Malcolm Merlyn, the Dark Archer and Thea’s father, has been promoted to series regular for season 3.

In the finale, Merlyn took Oliver’s half-sister Thea with him to parts unknown. The CW’s new synopsis for Arrow might provide a few details about where this storyline will go:

After a violent shipwreck, billionaire playboy Oliver Queen (Stephen Amell) was missing and presumed dead for five years before being discovered alive on a remote island in the Pacific. He returned home to Starling City, bent on righting the wrongs of his family and fighting injustice. To do this, he creates the persona of the Arrow and allies himself with former military man John Diggle (David Ramsey), computer-science expert Felicity Smoak (Emily Bett Rickards), street brawler Roy Harper (Colton Haynes) and international assassin Sara Lance (Caity Lotz), while keeping his secret from those closest to him including his sister Thea (Willa Holland), who has allied herself with his most deadly enemy. Rivalries and allegiances will shift as Oliver faces his most difficult challenge yet.

Fans of Arrow can expect to see quite a few changes when the series returns this fall, now that Oliver has lost his wealth, his mother, and his sister to the villains in his life. Season 3 should be quite interesting to watch him try and fix it all.

Are you happy with Barrowman joining the cast of Arrow as a regular? Are you excited to see The Flash leads its own night? Let us know in the comments.

The Flash and Arrow season 3 will air in Fall 2014 on The CW.