Here's a "DC Gothic" that, like DEADMAN, preceded my previous candidate for the company's second non-anthology "weird feature," which I had previously pegged as the SHOWCASE debut of the Phantom Stranger: the CHALLENGERS OF THE UNKNOWN, a failing book that the company strove to shore up with spooky content.
One issue during this run had the heroes encounter both DC's private eye character Jonny Double and their high-wire haunter Deadman.