Return of the Thunder Cloud is a short story by Zack about a grown-up and retired Thunder Cloud returning to reclaim their superhero identities. The film, Thunder Cloud (2009 film) is very loosely based on this story.
The man who was once Snap Dragon, searching the attic that had once been the team's meeting place, discovers a shard of the Blue Crystal that had originally given them powers as children. He calls the others, and must convince them to reclaim their identities.
The story is interspersed with flashbacks, depicting the team gaining their powers for the first time.