Castle: Unholy Storm

In 2014, Marvel released Castle: Unholy Storm, a one-shot comic that transplants the gritty, procedural world of the TV series Castle into the Marvel Universe. Written by Cullen Bunn, with art by Andrea Mutti, Robert Atkins, and Will Sliney, the issue sends Richard Castle and Kate Beckett on a case involving a supernatural serial killer, blending crime drama with Marvel's darker, mystical corners. While a brief outing, it stands as a curious crossover moment, bridging the grounded crime fiction of the show with the publisher's wider, more fantastical lore.