Cassidy Williams was one of the Original Mystery Incorporated members that vanished. She is the "Velma" character of the group. She under the name "Angel Dynamite" when she was suspected missing
Velma suspects that Angel Dynamite is Cassidy in disguise. When Angel reveals herself to the rest of the gang, they're upset that she lied to them.
- She died while underwater fighting the german robots
- Cassidy got revived when the timeline was remade and she married a now healthy Ricky Owens.