The lead Jet Powers tale is an astonishingly bleak story. The world as we know it really DOES end. By the time Jet and Su Shan stop the disaster from getting worse, countless millions of people are dead and the 20th century social and economic systems are destroyed. Whew! But not to worry. All this is forgotten by the time the next story begins. Everything is back the way it was.
EDIT: After posting this comment I checked out issue #4 and discovered that there was a follow-up story in which Jet and Co. battle would-be tyrants trying to reorganize society. #4 also has a sequel to the Jet Powers-in-space story from #3. The writers really boxed themselves in here. JP lives in two separate incompatible realities in the same issue. They probably breathed a sigh of relief when the book was canceled.
Link to the book:
Jet Powers 03 [A1 035][ME 1951]-c2c -Jetstone