While it is easy to mistake which series a given book belongs to, the easiest way to distinguish between them is by the characters at the top of each front cover, beneath the series title. In this series the characters from left to right are: Logan, Iron-Man, Spider-Man and Hulk.
Each issue has two numbers; an issue number as a sticker on the cover, and a number on the spine giving the order they should be shelved in order to show a panoramic picture across the spines. While the books are the same as the 2012 series and released in a similar order, the spine numbers differ and there are no 'classic' spine numbers.