This story is in canon but out of continuity, the most recent Issue was 12, but this story does not directly connect with it or Issue 13.
Cover: TIC Superheroic Christmas Special 1968! 80-Page Giant! The cover art shows all of the heroes in ranks, some with hats, singing Christmas Carols. Circles around the edge have team names: Heroes Inc, the New Atlantians, the LA Stars, Freedom Five and more!
Opening page: A list of stories with the faces of the team members next to the team name.
Sea of Stars RPG Design Journal 