Martians don't know how to laugh! So they send a martian, Exerel, to find the secret of laughter. Meeting Bud Hadley, an ex-comedian hunted by police, Exerel bargains with him for the secret.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. Characters, synopsis, and writer signature provided by Doc Mars via the GCD Error Tracker.