Based on the Archie Comics graphic novel The Chilling Adventures of Sabrina, Netflix’s Untitled Sabrina Project is set to be an hour-long drama that will reimagine the story of Sabrina the Teenage Witch as a dark coming-of-age tale that traffics in horror, the occult and witchcraft. Twenty episodes have been ordered across two seasons.

THR reports today that Michelle Gomez (“Doctor Who”) and newcomer Chance Perdomo are the latest to join the cast.

“Gomez will play Mary Wardell, Sabrina’s (Shipka) favorite teacher and mentor at Baxter High. When she is possessed by the Devil’s handmaiden, Madam Satan, Ms. Wardell turns into a sultry, cunning manipulator who is always trying to lure Sabrina down the Path of Night.

Perdomo, meanwhile, will play Ambrose Spellman. The character is Sabrina’s warlock cousin from England. Placed under house-arrest by the Witches Council, Ambrose is forbidden from leaving the funeral home where he lives with the Spellman women. Witty, puckish and pan-sexual, he is one of Sabrina’s partners in crime, always up for mischief.”

Kiernan Shipka (“Mad Men”) was recently cast as Sabrina Spellman, a new take on the character originally played by Melissa Joan Hart. Jaz Sinclair (Paper Towns) co-stars. Sinclair will play the role of Rosalind. Brash, empowered, and outspoken, Rosalind Walker is the daughter of Greendale’s minister and Sabrina’s best friend at Baxter High.

“Tonally in the vein of Rosemary’s Baby and The Exorcist, this adaptation finds Sabrina wrestling to reconcile her dual nature — half-witch, half-mortal — while standing against the evil forces that threaten her, her family and the daylight world humans inhabit.”

Roberto Aguirre-Sacasa executive produces and writes. Lee Toland Krieger will executive produce and direct. Other executive producers include Greg Berlanti, Sarah Schechter (Berlanti Productions) and Jon Goldwater (Archie Comics).