In the strange and terrifying world of 1970 Parallel Time, Angelique the witch torments Maggie Collins with her supernatural powers, causing Maggie to fear her husband, Quentin. Angelique reveals her true identity to her father, Timothy Stokes, and warns housekeeper Julia Hoffman that the vampire, Barnabas Collins, must be destroyed. John Yaeger, the evil alter ego of scientist Cyrus Longworth, kidnaps Maggie. Barnabas returns to Collinwood in regular time to notify Dr. Julia Hoffman of the perils occurring in Parallel Time, where her counterpart discovers Barnabas' coffin and makes plans to stake him. Longing to discover who she is, Barnabas initiates an experiment to revive the body of the mysterious and beautiful Roxanne Drew, with whom he becomes obsessed. After a series of deaths, a crazed Stokes sets fire to Collinwood.
Maggie meets Yaeger on the docks and he reveals details about the seance.
Angelique causes Maggie to have a dream about finding a secret.
Hoffman tricks Maggie into wearing Angelique’s dress to a costume party.
Roger cruelly compares Maggie to Angelique, whose voice taunts Maggie.
Barnabas makes an attempt to discover if Alexis is really Angelique.
Angelique makes a confession to her stepfather, Timothy Stokes.
Yaeger rents a run-down farmhouse. As Cyrus, he asks Maggie to meet him on Widows’ Hill.
Yaeger and Angelique agree on a plan. He kidnaps Maggie, hiding her at the farmhouse.
Yaeger forces Maggie to write a note to Quentin. Angelique asks Stokes for help.
Stokes explains that the life force of another woman has enabled Angelique to return.
Hoffman spies Barnabas entering the secret room at the Old House.
Barnabas realizes that there is a connection between Cyrus and Yaeger.
Cyrus transforms into Yaeger. He returns to the farmhouse, ready to kill Maggie.
Hoffman goes to the Old House and prepares to stake Barnabas in his coffin.
Dr. Julia Hoffman arrives from 1970 and confronts her housekeeper counterpart.
Angelique tries to make Quentin believe that Maggie is a witch.
Barnabas and Julia go to destroy the body used in Stokes’ experiment to resurrect Angelique.
Angelique tells Bruno that she needs more proof that Quentin was her murderer.
Inspector Hamilton questions Quentin about Angelique’s death. Quentin fights Bruno.
Quentin reveals to Barnabas the evidence of witchcraft he found in Maggie’s possession.
Carolyn dreams of Angelique being dead and awakens claiming to know the murderer.
Barnabas decides to steal the body at Stokes’ house and a ghost appears.
Barnabas and Will bring the body to the secret room at the Old House.
When Barnabas raises the body of Roxanne Drew to sit, Angelique collapses.
Roxanne is able to walk and responds to the drawing of her by Claude North.
Stokes attempts to find Roxanne. Barnabas discovers her in the Collins Mausoleum.
Hamilton discusses his suspicions of Julia with Angelique.
Carolyn goes to the tower room where she encounters Angelique’s murderer.
Julia decides to experiment on Roxanne, hoping to cause Angelique to die.
Maggie has a nightmare of an angry Quentin attempting to strangle her.
In the Parallel Time room, Angelique sees counterparts in the present time.
Angelique locks Julia inside a secret room in Collinwood's basement.
Maggie becomes convinced that Quentin has gone insane.
After being hypnotized, Maggie is prepared to shoot Quentin.
At the command of Claude, Roxanne speaks. Quentin reveals a secret to Maggie.
Roxanne comes to Barnabas. He and Hamilton search to find the missing Julia.
Barnabas discloses that he and Roxanne can never be together.
Vowing revenge on Barnabas, an enraged Stokes seizes Maggie.
Barnabas and Julia become trapped in the Parallel Time room.
In the year 1995, the estate of Collinwood lies abandoned in ruins.