Welcome Back, Carter

Cockrum apparently did a lot of character design work before the first issue was published, as you can see in this editorial.  He designed John Carter, Dejah Thoris, Tars Tarkus, and many other elements of Barsoom.  Of course, this being Marvel, the title of the editorial has to reference something in pop culture: Welcome Back Carter references Gabe Kaplan’s TV show, Welcome Back, Kotter!