DC All Access debuted an exclusive clip for this week's episode of "Arrow," titled "Haunted," featuring fan-favorite character John Constantine returning to TV -- this time joining The CW's "Arrow"-verse.

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Matt Ryan is also making his way back to TV, reprising his role from NBC's "Constantine" following its cancellation after just one season earlier this year. In "Haunted," Oliver Queen (Stephen Amell) calls on his old pal John Constantine to help out when the resurrected Sara Lance (Caity Lotz) turns violent.

"Haunted" airs tomorrow night at 8p.m. ET/PT, 7p.m. CT on The CW.