Adventure Comics (1938-) #300

Beginning the Legion of Super-Heroes back-up tales! Things kick off with a brand new team member: Superboy's lost friend, Mon-El! Plus, Superboy stars in the main feature "The Super-Planet of Clark Kent and Lana Lang!"

Written By:
Henry Boltinoff, Jerry Siegel, Mort Weisinger
Pencils:
George Papp, Henry Boltinoff, John Forte
Inks:
George Papp, Henry Boltinoff, Al Plastino, John Forte
Cover By:
Curt Swan, Ira Schnapp, George Klein