Originally they were the respective "hosts" of the EC-style horror comic anthologies House of Mystery and House of Secrets, which ran from the 1950s through 1983—Cain debuting in House of Mystery #175 (1968) and Abel in DC Special #4 and House of Secrets #81 (both 1969). During the 1970s, they also co-hosted the horror/humor anthology Plop!. They were also both recurring characters in DC's Elvira's House of Mystery (1986–88).
