Angel Dynamite was the alias/alter ego used by a now adult Cassidy Williams, who had mysteriously disappeared along with the other members of the original Mystery Incorporated after they had just as mysteriously broken up. Cassidy later 'returned' to Crystal Cove at some point, now using the persona of "Angel Dynamite", working as a radio hostess of Crystal Cove's K-Ghoul, and befriending the new Mystery Incorporated. When the gang found out who she really was and that she was working with Mr. E, she decided to go by her birth name, Cassidy Williams, again.