Main cast
Michael Chiklis as James "Jim" Powell, Sr. – a police sketch artist whose power is super-strength (he can lift 11,000 lbs). He is nearly invulnerable, and can leap over tall buildings (or jump a quarter-mile). When in contact with cinoxate, his powers fail. His weakness lies in finesse and agility.
Julie Benz as Dr. Stephanie Powell (née Crane) – a scientist who works at Global Tech. She has super speed (running 10 miles in just under five seconds) and an incredibly fast metabolism that allows her to heal quickly. When she was attacked by Lucas Winnick, an animal-like posthuman, she was injected with the Trilsetum coronis serum in an attempt to save her life. This allowed her to (possibly only temporarily) run faster than the speed of light, enabling time travel. She was initially working on the research of the Trilsetum coronis, the "crown jewel" plant of the Amazon Basin. She later found out that the plant shared the same chromosomes as the family's superpowered DNA.
Kay Panabaker as Daphne Nicole Powell – Jim and Stephanie's 16-year-old daughter. She has the power of telepathy and the ability to view the memories of others. She later discovered that she could also influence the behavior of others for a short time by means of telepathic suggestion (the term "pushing" was also used to describe this ability, possibly in reference to a similar ability possessed by the Andy McGee character in Firestarter by Stephen King). She also develops the ability to erase memories through this method.
Jimmy Bennett as James "JJ" Powell, Jr. – Jim and Stephanie's 14-year-old son; a teenager with enhanced intelligence. He has the ability to speed-read and comprehend large amounts of information by just reading the page (initially only capable of remembering it for six hours). This ability gives him a photographic memory. He is also capable of learning a new language fluently in a matter of minutes. His powers extend to a form of "genius vision". When he experiences intense emotional stress, his powers fail. His enhanced intellect appears to extend his ability to handle extra-academic situations, enhanced fighting skill being an example. It is revealed that he is immune to Daphne's telepathic push.
Autumn Reeser as Katie Andrews – a lab tech and Stephanie's personal assistant at Global Tech and comic book fangirl. She is aware of the Powells' superpowers. She is also dating the Watcher (under the alias of Will and later Joshua), but it is unknown to her that he had been hired by Dr. King to find out about the Powell family's abilities. Her favorite superhero(ine) is Kitty Pryde. Katie acquired telekinetic powers due to her pregnancy with Joshua's child. Katie and Joshua eventually reconnect after he returns and helps Katie deliver their baby prematurely. The baby initially appears to be stillborn, but its eyes quickly flash green and it returns to life, presumably as a result of its Trilsetum coronis DNA.
Romany Malco as George St. Cloud – an assistant district attorney in Pacific Bay and long-time friend of Jim's. He also knows of the Powells' superpowers. He is a comic book fanboy. He sponsors and runs the crime-fighting intelligence network ("The Lair") from his garage which he has equipped with hi-tech surveillance, tracking and computer equipment. In the season one finale, George is aboard an airplane along with 80 prisoners who are to be turned into super villains. Since George survived the crash it is presumed that he also developed super powers like the rest of passengers on the plane after crashing in the same manner as the Powells.
Stephen Collins as Dr. Dayton King – Stephanie's boss at Global Tech and, as the series unfolds, a key figure in the Powells' super-powered universe. He is a typical Hitchcockian villain to the series (i.e. a character who clearly cannot be trusted). He is also in love with Stephanie Powell. In episode 14, through the security cameras, he finally learns of Jim and Stephanie's powers. In episode 16, it is revealed that he is The Watcher's adoptive father and has some sort of interest in JJ's powers. It is revealed he took the serum to heal himself after contracting cancer. In episode 20, JJ injects him with Stephanie's power cure, and King dies when the cancer returns at an accelerated rate.
Josh Stewart as the Watcher – Dr. King's super villain enforcer and assassin, his control of people's memory allows him to return under different aliases, Will and later Joshua, when interacting with the family during his investigation of them. His powers are temporary, and without regular injections from Dr. King to maintain them, he undergoes withdrawal. He has been shown to have the abilities of telekinesis, telepathic suggestion, and an immunity to Daphne's telepathy. In Episode 11, he surrenders the injections that give him his powers in order to start a normal relationship with Katie. In Episode 16, he learns that Dr. King is his adoptive father who saved his life from a terminal illness by injecting him with the serum when Joshua was 6 years old. In the season finale, Joshua helps JJ figure out the secret to making the super powers permanent, after which Dr. King tells his "son" that Joshua should go and be with his family. Joshua returns to Katie, and, after turning Victoria away, helps Katie deliver their child.
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