Superman the offer. Siegel and Shuster submitted their work in late February and were paid $130 (AFI $) for those 13 pages. In early March they signed a contract (at Liebowitz's request) in which they released the copyright for Superman to Detective Comics, Inc. This was normal practice in the business, and Siegel and Shuster had given away the copyrights to their previous works as well. Superman was finally published on April 18, 1938, in the first issue of "Action Comics". The magazine sold very well, and feedback from readers showed it was because of Superman. Siegel and Shuster read pulp
Superman/Batman Batman discover each other's secret identities and agree to work together, even though they disagree with each other's methods of operating. The issue is a reimagining of "The Mightiest Team In the World", the tale from "Superman" #76 (May–June 1952) in which the two heroes discover each other's secret identities and team up for the first time. In "The Unexamined Life... " ("Annual" #2 (2008)), Superman loses his powers and takes on the identity of Supernova. The issue is a reimagining of "The Has-Been Superman" from "World's Finest Comics" #178 (September 1968) and "Superman's Perfect Crime" from "World's Finest Comics"