A mysterious abnormal attacks Abby, and Magnus and Will discover there's only one way to communicate with this unusual enemy - through music.

The Cabal's new "Super-Abnormals" begin destroying Sanctuaries around the world. It won't be long before they launch their attack on the Old City Sanctuary, and Magnus must choose between saving Ashley and saving the Sanctuary Network.

A disoriented Magnus wakes up to find the Sanctuary in ruins and the entire city decimated, with no memory of how the devastation occurred. While surveying the destruction, she is attacked by an inhuman creature but saved by two armed men who stun her and take her to an abandoned warehouse. After being hosed down and left shivering and exhausted, Magnus fears the worst when a battle-scarred figure enters the room.

While transporting a usually docile abnormal, Magnus's helicopter crashes, leaving her and Will stranded in the shaft of an abandoned oil rig. They soon find they are not alone in the water.

Word of a possible werewolf sighting prompts Henry and Will to visit an English psychiatric facility. As they probe a potential connection to Henry's Hyper Accelerated Protean past - and future - Magnus and Tesla investigate the mysterious holographic city.

Kate gains super-hero-like abilities when an Abnormal attaches itself to her for safe keeping.

Magnus responds to an anonymous call for help at an abandoned building. But when she gets trapped inside, she discovers whoever made the call has a very different agenda.

Will takes command of the Sanctuary while Magnus and Druitt search for a critical artifact in London. Knowing that Magnus's only hope for a cure lies in the secret subterranean city, Will ignores her warnings and releases Adam-Hyde in the hope that he will lead them to an access point for Hollow Earth.

Will and Henry's double date goes awry when Magnus tasks them with an Abnormal delivery.

With chaos all around them, the team must come to terms with how to rebuild after the Cabal’s attacks. Magnus takes a methodical approach to prove Ashley is still alive, while Will and Henry take on the daunting task of processing the hundreds of Abnormals who now seek refuge at the Sanctuary.

A superhero is trapped by Magnus, and his lack of finesse affects the team's work. Elsewhere, Will and Declan go on the search for a creature that's loose in the city, after the discovery of an eggshell.

Dr. Helen Magnus fights to save the life of one of the Sanctuary’s research scientists who was viciously attacked by a seemingly docile Abnormal. Baffled by the creature’s uncharacteristic behavior, Henry tries to figure out what, or who, caused the domesticated Abnormal to react so violently.

The team goes on a routine mission to retrieve an Abnormal and take it to safety. But the mission becomes anything but routine when they are forced to stage a bank heist in order to protect the public from harm.

Nikola Tesla surfaces, sending Helen an SOS from the Colombian Highlands - but Will doesn't think he can be trusted.

With Adam on lockdown at the Sanctuary, Magnus investigates his connection to Hollow Earth - and Druitt - while being forced to reveal dark secrets about the chaotic origins of the Five.

Investigating the disappearance of an old college friend, Will finds himself caught in an underground fight club where the combatants are genetically engineered abnormals who fight to the death like modern day gladiators.

The search for Ashley puts Magnus and her allies in the path of Kate Freelander (Agam Darshi), a con artist with ties to the Cabal who divulges the location of a secret facility

Will goes up against the heads of the Sanctuary Network to defend Magnus who is charged with a shocking murder. But as the evidence stacks up against her, even Will has trouble finding a way to convincingly defend her innocence.

While an old friend of Magnus', a pouched abnormal named Jimmy, is handing over a fire elemental to the Sanctuary team, they are attacked by a gang of criminal abnormals from Chicago. The situation presents a lot of mysteries to be solved and quickly.

The team rescues the occupants of a sinking ship off the coast of South Africa and teleport them to the Sanctuary. However, Magnus suspects Druitt of murdering one of the passengers during the rescue.

Will suffers from amnesia regarding the events of his near-death experience, but some unwanted visitors become intent on finding out what is locked in his memory.

Looking to share a quiet, "normal" evening out with Abby, Will and his date are abducted en route to the restaurant by a desperate gang leader who faces certain death without their help. Then, upon learning the abductor's identity, Magnus suddenly ceases all attempts at rescue.

When rich youngsters begin to disappear after an apparent death and then come back to life, the trail leads Will & Magnus to a drug clinic in Mexico run by Nicola Tesla. Knowing his all-times plans, big trouble to be expected.

A colleague vanishes amid unexplained disappearances in Normandy, France, where Magnus and her team run into a military blockade during their investigation

Will runs into unexpected trouble and personal revelations on a trip to the Liberian Sanctuary in Monorovia. Meanwhile, Magnus has her hands full when a couple of ne'er-do-well flying Abnormals recruit her help with a questionable scheme.