Letters credit from Todd Klein via http://kleinletters.com/.
Title, credits, table of contents and indicia information pages.
Set in Gotham City at Christmas Eve.
The second page of the original story has been cut.
Uncle Marvel does not appear in costume. Captain Marvel Jr. and Mary Marvel identities are seen in splash panel only.
This story was originally 3 pages in House of Mystery #191. The added splash/introduction page is by Howard Chaykin, reprinted in altered form from Forbidden Tales of Dark Mansion (DC, 1972 series) #15 (March 1974) with image of Cain (in lower right) by Berni Wrightson pasted in from the Wrightson splash page in House of Mystery (DC, 1951 series) #211 (February 1973). "House of Mystery" was added across the top of splash page.