* Carter Ryan: A high school student who is recruited by a secret organization of superheroes called the Sentinels. Carter has the ability to run at super-fast speeds.
* Chloe Saunders: A brilliant scientist and engineer who is also a Sentinel. Chloe is Carter's best friend and helps him develop his powers.
* Dr. Evelyn Hart: The leader of the Sentinels. Dr. Hart is a wise and powerful woman who has been fighting evil for many years.
* The Sentinels: A group of superheroes who protect the world from evil. The Sentinels include a variety of characters with different powers, such as super-strength, flight, and telepathy.
* The Villains: A group of evil villains who want to destroy the Sentinels and take over the world. The Villains include a variety of characters, such as a mad scientist, a powerful sorceress, and a giant monster.