Trapped in the past, Abbie tries to convince Ichabod that they are future partners while trying to stop Katrina from assuring the Horseman's victory.
Ichabod and Abbie try to stop Henry's scheme to use a mystic bell to create a new cult of witches. However, they learn that he has an unexpected ally. Meanwhile, Irving comes after Jenny.moreless
Ichabod and Abbie find a new series of tunnels beneath Sleepy Hollow and have an encounter with an old friend of Ichabod's. Meanwhile, Katrina receives a visit from Henry, and Jenny receives a visit from Irving.moreless
Team Scorpion work undercover on a cruise ship to locate and disable stolen rockets. Meanwhile, Toby and Happy help Ralph deal with his first crush, as Valentine's Day approaches.
Solomon Kent, a warlock who set off the Salem Witch Trials to protect himself, seeks out a Grimoire that will give him the power to undo the mistake in his past that turned him into a warlock. Meanwhile, Irving approaches Abbie, while Henry contemplates his past and decides on his future.moreless
A patient infected with a contagious and lethal strain of bird flu is kidnapped and the culprits intend to weaponize the virus.
Nick's godmother, the woman who raised him after his parents died, asks for his helping stealing a mystic artifact. He reluctantly agrees, putting him at odds with Abbie, Ichabod, and Jenny. Meanwhile, Irving is cleared of the charges against him but Cynthia still has concerns.moreless
To prevent nuclear weapons from being launched from a secret U.S. nuclear silo, the team has to prod the memory of their only hope, an injured former Secret Service agent. Drew proposes that moving to Maine might be best for Ralph.moreless
Ichabod and Katrina attend the Sleepy Hollow Historical Soiree and become embroiled in a murder. Meanwhile, Abbie receives an unexpected visit.
The team must uncover the mole inside the CIA who's stealing deadly chemicals. Paige gives Walter a flirting lesson.
While questioning their purpose now that Moloch is dead, Ichabod and Abbie discover that a group of demons have escaped from Purgatory... as has an angel, Orion. Meanwhile, Katrina offers Abraham the chance to restore his humanity.moreless
Team Scorpion try to save a boy on Christmas Eve when he gets trapped in a beach-side cave and the rising tide threatens to drown him.
Sylvester is seriously injured when he accidentally triggers an explosive device during an investigation; and Team Scorpion search for who is responsible.
The End of Days draws nigh, and Ichabod and Abbie capture Abraham in the hopes of learning where they can find Moloch and Henry. However, Abraham reveals that the Sword of Methuselah can only be used at a terrible cost.moreless
Team Scorpion tries to recover stealth technology before it falls into enemy hands when a military plane is shot down in Bosnia. Meanwhile, Walter's sister takes a break from her MS treatment and spends time at the garage with Sylvester.moreless
Abbie and Jenny investigate strange suicides at Tarrytown that may be connected to their mother Lori. Meanwhile, Katrina realizes the nature of the baby and prepares to banish it back to Purgatory.
The team tries to protect Cabe's ex-wife, after she uncovers evidence that suggests foul play in the death of a prominent congressman.
Ichabod and Abbie join forces with Katrina to take on a succubus that Henry has sent out to drain the life force from her victims, killing them.
A musician, who created a controversial algorithm that generates hit songs, helps Team Scorpion find a music blogger's murderer. Meanwhile, Drew asks Walter to help him connect with his son.
Henry brings in a doctor to monitor Katrina's condition after her sudden illness. She manages to escape and Ichabod finds her, and they realize that Moloch has a new plan to manifest on Earth. To stop him, Ichabod reaches out to Henry to use his powers to save his mother.moreless
Three convicts break out of prison and the investigation reveals that one of the escapees is a brilliant hacker who is being forced to help the other two steal billions of dollars online. Meanwhile, Paige tries to manage expectations for Ralph when his father returns.moreless
Corbin's son Joe returns from overseas after receiving an honorable discharge after his platoon is wiped out in a bizarre attack. Ichabod and Abbie soon realize that something is wrong with him. Meanwhile, Henry tells Irving that there is a way for him to free his soul, but it has a cost that Irving may not want to pay.moreless
Team Scorpion must pass a mandated psych evaluation or face being disbanded after they are accused of destroying a priceless work of art. Meanwhile, Ralph is reluctant to go to his school's Halloween party, so Paige asks the team to step in and help.moreless
Walter enlists the help of a former troubled team member when a Los Angeles nuclear reactor is on the verge of a cataclysmic meltdown.
A ghostly spirit, the Weeping Lady, kills Ichabod's friend Caroline. After it attacks Abbie, Ichabod realizes that the ghost is going after his loved ones... and Katrina is her next intended victim.
When a child in Sleepy Hollow goes missing, Ichabod and Abbie realize that a Pied Piper-like creature that serves Moloch is responsible.
Team Scorpion go to Las Vegas for a simple casino job, but a robbery leads to Walter's arrest, leaving his colleagues to try and clear his name.
Three young women rob a tour bus, but things go horribly wrong when a man is killed and the women unknowingly steal something of great value that puts their lives in danger.