Season 4

Host Tracy Morgan helps scare a caterer caught in the middle a deadly food rivalry.

A medical experiment takes a sinister turn; pranks involving a séance and a freak show play out. Actor Judah Friedlander ("30 Rock") guest stars.

A prank is played on a model who thinks she's helping with an auction; a demonic baby becomes trouble for a caretaker; an actor meets a madman on a hidden-camera show; a missing girl reappears amid unusual circumstances.

A singing telegram revives a dead man; a wine-maker's secret ingredient is revealed; a vampire gets "murdered"; a laundry worker encounters a psychopath.

An organ-harvesting prank is featured, along with segments involving a witch, aliens and a creature that caused an accident.

A delivery guy, a temp worker and a production assistant play roles in pranks. Also: a witness in the witness protection program has a disturbing visitor.

An actor's joke on a mobster does not end well; an old book that can summon spirits is used in a prank; a news crew's report on death cults goes awry;a demonic doll causes trouble for a babysitter.

A mummy menaces; a horror film actor goes on a rampage; a lab assistant encounters a deadly mist; a documentary film crew finds a winged monster.

A plant grown in space becomes a student's problem; a sister's prank on her brother goes awry; a television crew visits a house where an old butler still serves his dead master; a doorman considers drinking a magic elixir.

A property inspection takes a sinister turn; a new male enhancement drug is tested; a student and a police officer encounter unusual diners at the diner; a crew pursues a mind eraser to a chilling conclusion.

A giant reptile nest is found in an old facility where tests on animals were conducted; a farmer's organic soil has a dark secret ingredient; a temp worker gets spooked by a drug developer; a lab tech becomes entangled in a scientific rivalry.

A new dog collar is tested; a geological work crew is exposed to a dormant virus; a delivery worker becomes trapped in an asylum; a pregnant woman carries a belly full of snakes.

A prank with a female robot that runs on blood; a babysitter summons evils spirits with a Ouija board; a beekeeper's ambition plays out; a plumber and his assistant encounter a bunch of snakes.