These were the back-up stories in classic X-men comic - featuring short slice of live adventures showing a different - more human side of the X-men. Stories that happened between the panels of the regular X-Men comic.
Wolverine's first game of "tag" with Sabretooth. Storm's claustrophobia put to the test in the tunnels of the New York Subway. Cyclops' jealousy. Xavier's insecurity. Logan and Jean's first kiss. Nothing world-shattering. Just ordinary stories about extraordinary people. Reprints stories from Classic X-Men #1 - #13.