Arrow Season 3 Spoilers: 'Game-Changing Twist' Coming in Episode 15

Season 3 of the CW's Arrow rolls on with a new episode on Wednesday, and Oliver Queen (Stephen Amell) is back in Starling City full time following his defeat at the hands of Ra's al Ghul. And according to showrunner Marc Guggenheim, that was just the tip of the iceberg.

Guggenheim told the following to TVLine:

"I feel like we're entering the 'third act' of the season, following Sara's murder and that investigation, and then Oliver 'dying' at Ra's al Ghul's hand, to protect Thea.
The season is more demarcated in fourths, as opposed to the traditional three-act structure. Certainly Episodes 10, 11 and 12 were their own 'mini-act,' with Team Arrow moving on in the wake of Oliver's apparent death. Episode 13 kicks off the next piece of our story, and things get a really crazy from here on out. Episodes 13, 14 and 15 are probably the next 'book' or movement in the story, 15 ends with a game-changing twist, and from 16 to 23 it's just one crazy run up to the finish line. [Laughs] I'm really excited about where we're going mainly because, as I tweeted out, when all is said and done with Season 3, stabbing Oliver through the chest and kicking him off a cliff will end up being the least crazy thing we do all year. I encourage people to watch the whole season and then confirm whether or not I'm telling the truth."

What do you think this "game-changing twist" could be? Let us know your guesses in the comments section.