The Amazing Spider-Man #503 Cover Variant-A is a 2004 Marvel Comics single issue featuring Spider-Man (Peter Parker) and written by J. Michael Straczynski. This modern age comic book is a must-have for any Avengers fan, with a key issue storyline titled "Chasing a Dark Shadow." The cover art is by Scott Hanna, and the comic book is intended for a general audience. The issue number is 503, and it is part of The Amazing Spider-Man series title. Don't miss out on the first appearances of Morwen and Tess Black, making this a minor key issue for collectors!