For this, the next-to-last issue of Adventure Comics, DC changed up the contents a little plus ran with this beautiful, striking cover by Ed Hannigan and Klaus Janson.
We open again with an untitled Plastic Man story by Martin Pasko, Joe Staton, and Bob Smith, followed by:
The Legion in "The Renegade Superhero" by Edmond Hamilton and John Forte
Captain Marvel in "The Human Hawks" by Otto Binder and C.C.Beck
The Spectre in "The Parchment of Power Perilous" by Steve Skeates, Jerry Grandinetti, and Murphy Anderson
"Can This Be Death?..." by Skeates, Jim Aparo, and Dick Giordano
new feature Zatanna in a self-titled tale by Len Wein and Gray Morrow
The Legion in "The Menace of Dream Girl" by Hamillton and Forte
...judging by the last sentence in Paul Levitz's Legion text feature, "If you'd like to see more of these tales, write in and let editor Nick Cuti know!", the decision to cancel Adventure--one of DC's three longest-running titles--came very, very abruptly, and that they didn't even know #503 was the final issue as they worked on #502.