"The Most Deadly Weapon"
Superman Daily Newspaper Strip - May 1, 1939 to June 10, 1939
I am sorry to say that this does not end well for Ambrose.
In this installment of the newspaper dailies, Clark is sent to interview Professor Runyan, who has invented a deadly airborne toxin which permeates gas masks. No worries, he’s only giving it to the government if they promise only to use it in a defensive war (the men who later steal his plans aren’t quite as ethical). Thankfully, at the end of the story, Superman destroys the gas and the notes used to create it …
Notably, this arc finally gives a name to Clark’s boss - George Taylor, a name which probably remains in continuity today (it’s hard to say, you know?) After Earths 1 and 2 are rolled out during National’s silver age, George continues to sit at the editor’s chair over at Earth-2’s The Daily Star (in contrast to Earth-1’s Perry White - whose debut is still a ways down the road - at The Daily Planet), while post-Crisis stories generally have Taylor preceding White as the Planet’s chief.