Conversation so far:
What's relevant about Wesley Dodds' Sandman's Twilight Years?
Wesley Dodds' Sandman is one of a number of Justice Society members who finds themselves in the Ragnarok Dimension during the early Modern Age of comic books.
Are there any other interesting aspects about Wesley Dodds' Sandman besides the Twilight Years?
Both Wesley Dodds' Sandman's age and his physical limitations became a theme writers would use in this character's post-Crisis stories.
What is Wesley Dodds' Sandman's Zero Hours?
During Zero Hour, Wesley Dodds' Sandman is returned to his proper age by the Extant.

Question: Who is Jack Knight?
Self-contained rewrite: Who is Jack Knight?