Mystery Men Comics #13

In "The Joe Pennelli Case, Part 1," Rex and Cynde are en route back to Mars when they answer a desperate plea to save all life on the dying planet Tarsis. With Cynde assigned to a separate vessel, she’s quickly captured by the villains Rof and Zard, setting off a tense, high-stakes mission. Written, drawn, and inked by Dick Briefer, this 1940 Fox comic features dynamic art and a gripping mystery, with Edd Ashe’s striking cover capturing the drama in bold, classic style.