All in a Day's Work is an episode of the television series Monsters. It was written by Jule Selbo based off a story by Maureen F. McHugh and was directed by Allen Coulter. It first aired May 6, 1989.
A white witch named Fiona Flynn (Adrienne Barbeau) is consulted by Steven Rose (James Morrison), a professor of ancient history who has unwittingly summoned a doppelgänger from an ancient text. The doppelgänger is trying to take over Rose's life, and Flynn summons a demon named Belphamelech (Eddie Velez) to deal with the doppelgänger. But with Fiona's son Ian (Brandon Bluhm) in the apartment while the conjuring goes on and Rose unlearned in the magical arts, things start to go wrong.