ACTION COMICS (1938) #70

“SUPERMAN TAKES A HOLIDAY!” A new villain, the Thinker, continues to outwit the Man of Tomorrow…until Superman decides to leave for a vacation and allows Clark Kent to take over for him! Superman: The Thinker stages a bank robbery and is about to escape in an armoured car when Superman shows up and captures his henchmen. The Thinker escapes by having previously kidnapped Lois, and now dropping her from a balloon, so that Superman has to rescue her. Superman decides to try a new strategy to defeat The Thinker – he goes on ‘holiday’ so that the rest will give him some new ideas. In his absence, he suggests that Clark can fill in for him. Lois, of course, thinks the idea is crazy……