The CW has released the description for the Oct. 7th season premiere of Arrow, titled "Green Arrow".
Season 4 Episode 1 "Green Arrow"
MY NAME IS THE GREEN ARROW
Oliver (Stephen Amell) and Felicity’s (Emily Rickards) blissful getaway is cut short when Thea (Willa Holland) and Laurel (Katie Cassidy) pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by “Ghosts,” assassins led by a dangerous man named Damien Darhk (guest star Neil McDonough). However, when Oliver returns, Diggle (David Ramsey) makes it very clear that he doesn’t want Oliver on the team.