Tonight on Arrow, Felicity started down a long, dark road toward helping get John Diggle out of custody and back into the world.

Meanwhile, during a recent interview, executive producer Wendy Mericle said that the process of freeing John was going to cost Team Arrow -- and particularly Felicity.

Yeah, Diggle is finally starting to process his guilt over his brother's death in a healthier way, but "He's going to be grappling with a different set of challenges in Felicity," Mericle told Screener. "Part of what kicks her off down this darker path is she's going to find evidence to exonerate him -- and he's going to have to deal with the fallout of the fact that Felicity is now going down a questionable path in part because of him."

Of course, that's not all that's pushing her down the road: Felicity will also be dealing with the death of her boyfriend, Detective Billy Malone, for the rest of the season.

Audiences have already seen, with last week's episode drawing a distinction between Oliver's quest for justice and Felicity's mean-on for revenge -- something we're seeing echoed in the journey of the new Black Canary tonight.

MORE: Arrow Stars Thanks Fans for Season 6 Renewal / Will Diggle's Son Grow Up To Be Connor Hawke on Arrow? Marc Guggenheim Answers / Arrow's Marc Guggenheim Offers Rare, Signed Invasion! Crossover Scriptbook To Benefit Bill Mantlo / Is Green Arrow Going Up Against the Dakota Access Pipeline In March? / [SPOILER] Returns To Star City in Arrow Midseason Finale Shocker / Stephen Amell Addresses The Big Twist In Arrow's Midseason Finale

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Arrow airs Wednesday nights at 8 p.m. ET/PT on The CW.