Explosion to Implosion
DC Comics did a marketing campaign between 1975 to 1978, during which 57 comic titles were premiered. This was known as "The DC Explosion". But, there was one unexpected foe who caused disastrous results: Old Man Winter! Due the Great Lakes Blizzard of 1977 and 1978, DC had extremely poor sales. For that and other economic reasons, DC has a massive cancellation of comic titles. Known as the "DC Implosion" (making fun of "The DC Explosion"), there were 65 cancellations. Also, the company had less than eight comics. Notable cancelled titles were All-Star Comics, Army at War, Aquaman, Mister Miracle, Shade the Changing Man, Black Lightning and Batman Family (which was "merged" with Detective Comics).
Cancelled Comic Cavalcade
Much of the unprinted work (that went unsold) actually did see print in Cancelled Comic Cavalcade, which had 2 issues. The content ranged from completed to uncompleted work. The original artwork was given to the rightful owners.