Constantine arrives in Star City, not to perform an exorcism, but to conduct a restitutionum on Sara, in order to restore her soul to her recently resurrected body.

"When things take a turn for the worse with Sara (guest star Caity Lotz), Oliver (Stephen Amell) calls in a favor from an old friend who deals in the mystical, John Constantine (guest star Matt Ryan). John Badham directed the episode written by Brian Ford Sullivan & Oscar Balderrama (#404)."

Matt Ryan's John Constantine guest stars on tonight's "Arrow" at 8 p.m. on The CW.