Arrow's Paul Blackthorne Previews Finale's 'Beautiful Exit' for [Spoiler]

Arrow Blackthorne Leaving Lance

The following contains a well-reported casting spoiler for the Season 6 finale of The CW’s Arrow.

As Season 6 of The CW’s Arrow draws to a close this Thursday at 9/8c, it will set the stage for an original cast member’s exit.

In the season finale, titled “Life Sentence” and written by exiting showrunners Wendy Mericle and Marc Guggenheim, Oliver — with a new ally on his team — will engage Ricardo Diaz in an epic final battle. Once the dust clears,  Team Arrow may be poised to bid adieu to one of its most trusted allies, for as previously reported, series vet Paul Blackthorne will not be returning for Season 7 as a series regular.

Speaking with TVLine at EW/People‘s Upfronts Week party, Blackthorne teased “an interesting exit” for cop-turned-interim mayor Quentin Lance. “It’s a beautiful exit, actually,” he quickly added. “A very nice exit, as exits go!”

Reflecting on his Season 6 arc, Blackthorne said “it was interesting to play” Quentin’s interactions with dead daughter Laurel’s Earth-Two doppelgänger, who for a stretch there, as the meta-powered Black Siren, helped Diaz terrorize Star City.

“It was kind of a mind-screw, the whole thing, in terms of who she was, reconciling that new relationship, and him trying to find hope in her and everything that she had gone through and become,” the English actor shared.

“All those scenes with Katie [Cassidy], it was a lot of fun,” he continued. “We’ve had six years of playing all that stuff, and it’s been a real, real treat. It’s a shame to see that go, but it’s wonderful to be in this new place now.”

That “new place” is The InBetween, which this week landed a spot on NBC’s 2018-19 schedule. The midseason drama stars Harriet Dyer (of Australia’s Love Child) as Cassie Bishop, a young woman who was born with the “gift” of seeing and communicating with the dead, helping them with their unresolved problems … whether she likes it or not.

Blackthorne costars as Cassie’s longtime friend/”surrogate father figure” Detective Tom Hackett, who with former FBI Agent Damien Asante enlists Cassie to help solve a darkly puzzling murder.

“We need her to help with the cases I’m trying to solve, using her psychic abilities — even knowing it puts her through hell to do that,” Blackthorne previews. “But when needs must, it’s, ‘Could you please help us out?'”

Want more scoop on Arrow, or for any other show? Email InsideLine@tvline.com and your question may be answered via Matt’s Inside Line.