One of the books I had for Christmas was Volume Two of
Showcase Presents: The Phantom Stranger collecting a whole bunch of stuff from the adventures of DC's mysterious man. The Showcase volumes are great value, reprinting old and hard to find issues in relatively cheap formats, the costs kept down in part by eschewing colour, showing everything in black and white.
One of the issues that was reprinted in Volume Two was
Justice League of America #103, where the Stranger meets up with the Justice League at the Rutland Halloween festival. Having read the issue before (and blogged about it
ages ago) I really only skimmed through it, eager to get to stories that I didn't know.
As I flipped through it, though, something about a handful of the panels caught my eye. In the story, the League battle Rutlandites under the control of Felix Faust. They come up against people in fancy dress some of whom wear costumes of heroes that were published by DC's marvellous rivals, making it the first (if unofficial) crossover between DC and Marvel.