Information surfaces and lives are at risk as Rebecca continues her dogged pursuit of Tommy Madsen.
Rebecca and Doc are closer to finding the man who might be the key to finding the secrets behind the returning criminals. A discovery beneath Alcatraz brings Hauser closer to the truth.
Rebecca, Doc and Hauser search for an unknown '63 who's returned more violent than before.
Clarence Montgomery was the only innocent man in Alcatraz but he's returned and is committing crimes.
Sonny Burnett, a man with a dark side, who became extremely violent while at Alcatraz reappears.
Herman and Pinky Ames, who almost escaped in 1963, return to Alcatraz in the present day and find something strangely wrong.
Madison and Hauser look for Johnny McKee, the latest Alcatraz inmate to surface. He's a chemist with a vicious killer instinct. More details emerge about Madsen's grandfather, Tommy Madsen.
When convicted bomber Paxton Petty reappears to place bombs throughout San Francisco, the team take methods from the past and apply them to the present to find him.
An Alzatraz guard reappears who, although basically a good guy, is being asked to do bad things.
After a well known bank robber reappears and things go wrong, Rebecca must figure a way to get him out of the hostage-filled bank before anyone discovers who he really is.
When child killer Kit Nelson, a terrifying kidnapper who always returns his victims home - after he's killed them - reappears from the past, the team is in a race against time to catch the man before he kills again.
An obsessive sniper starts targeting people in San Francisco, seemingly at random. However, this man is also from Alcatraz and Diego and Madsen start piecing together his motive. In the process of trying to catch Cobb, one of the team members is injured.
Detective Rebecca Madsen and Alcatraz historian Dr. Diego Soto, team up with a secret agency dedicated to finding and catching inmates from the Alcatraz prison who went strangely missing 50 years ago and are reappearing in today's world.