Crisis on Infinite Earths, from DC Comics, was not only a celebration of the publisher's 50th anniversary, but it was also intended to streamline the universe, to do away with the multiple earths, and to provide a near line-wide opportunity for jumping on points for new readers.
If that was the promise of Crisis, then Legends, the follow-up miniseries from DC, did its best to fulfill that promise. Having indulged in my current nostalgia craze, upon reading the first 6 issues of Marv Wolfman's & Jerry Ordway's The Adventures of Superman (part of the overall revamp of the Man of Steel), the house ads for new DC Comics series coming from DC in late '86 and early '87 bears that out. DC was firing on all cylinders. Just take a look.