The Fearsome Five is a group of villains gathered to defeat the Teen Titans. The founding members were: Doctor Light, Gizmo, Shimmer, Mammoth and Psimon. Psimon took the lead after Doctor Light was defeated by the Titans, and broke Jinx and Neutron out of prison to add them to the team - Jinx stayed with the team, but Neutron did not.
Banished by Trigon to another dimension for his failure to destroy the Earth, Psimon returned sought revenge on his former teammates. Mammoth barely survived although his sister Shimmer seemingly perished. Gizmo later resurfaced alive. The Five urged Sivana to take Lexcorp's nuclear missile facility near Joshua Tree, California after escaping.
- Doctor Light
- Deuce and Charger
- Doctor Sivana