<page_title> Silver Age of Comic Books </page_title> <section_title> Collectibility </section_title> <table> <cell> Detective Comics #225 <col_header> Title & Issue </col_header> </cell> <cell> Nov. 1955 <col_header> Cover date </col_header> </cell> <cell> First appearance of Martian Manhunter. <col_header> Relevance </col_header> </cell> <cell> Showcase #4 <col_header> Title & Issue </col_header> </cell> <cell> Oct. 1956 <col_header> Cover date </col_header> </cell> </table>
Martian Manhunter introduced in Detective Comics #225 predates Showcase #4 by almost a year.