The CW have released the first official description for "Sara", the fourth episode in Arrow 's third season. As well as details on the villain Simon Lacroix, a.k.a. Komodo, we also find out a lot more about Oliver's time working for A.R.G.U.S. and a character from the past makes a surprise return.

COLIN DONNELL RETURNS AS TOMMY MERLYN IN A FLASHBACK; MATT WARD GUEST STARS AS SIMON LACROIX, AKA KOMODO — Lance (Paul Blackthorne) calls the Arrow (Stephen Amell) when another archer appears in town and starts skewering businessmen. Diggle (David Ramsey) uses A.R.G.U.S. to find the archer’s identity; he is a man named Simon Lacroix (guest star Matt Ward), who goes by the codename Komodo. However, the team hits a rough patch with the mission and gets help from a surprising source – Laurel (Katie Cassidy). Meanwhile, Oliver begins to worry that he hasn’t heard from Thea (Willa Holland), which forces Roy (Colton Haynes) to tell him the truth about why she left town. Ray Palmer (Brandon Routh) pursues Felicity (Emily Bett Rickards). In the flashback, Maseo (guest star Karl Yune) tells Oliver that Amanda Waller has ordered his first kill. As Oliver looks down the scope of the rifle, he sees the target is his best friend, Tommy (guest star Colin Donnell). Despite her promise to her sister, Laurel debates sharing a secret about Sara (Caity Lotz) with Lance. Wendey Stanzler directed the episode written by Jake Coburn & Keto Shimizu.

For those of you who have read Jeff Lemire and Andrea Sorrentino's superb Green Arrow run, you'll know that Komodo is a great villain who should prove to be an exciting addition to Arrow. There's a lot of information to digest here, but the pretty huge reveal of how Tommy will factor into the episode is very interesting (even if it is a pretty major spoiler). It definitely sounds as if Laurel will come into her own in season three as well, while the brief mention of The Canary in an episode called "Sara" is intriguing to say the least! What do you guys think? Sound off below!