First issue edited by Joe Orlando; genre changes from superhero to horror.
Per Joe Orlando, from an interview in Comic Book Artist #1: "Carmine gave me the book (House of Mystery)and I remember that I drew the first cover from Carmine's layout." On The Drawing Board #66, April 1968, credits Roussos with cover art. Nick Caputo suspects Orlando penciled and Roussos inked the cover.
Previous indexer credited Nick Cardy, who is erroneously credited in Showcase Presents: The House of Mystery (DC, 2006 series) #1 and the book The Art of Nick Cardy, along with Carmine Infantino and George Roussos on inks.
Phantom Stranger-esque character
Writer credit from Showcase Presents: The House of Mystery (DC, 2006 series) #1.