Another DC Comics icon will make their Arrowverse debut during the Crisis on Infinite Earths crossover. IGN can exclusively reveal that Detective Jim Corrigan, human host of the powerful cosmic entity known as the Spectre, will appear in the crossover.
The CW has cast Stephen Lobo (Continuum, Supernatural) as Corrigan. The network isn’t confirming whether The Spectre himself will appear, though given the character’s role in the original Crisis on Infinite Earths comic, that seems a distinct possibility.
A publicity shot of Stephen Lobo
Source: IGN.com Spectre Joins the Arrowverse for Crisis on Infinite Earths Crossover