Frederick Mercer
Joy's Dad
General Information
Gender: Male
Family & Friends
Family: Joy Mercer (Daughter)
Willow Jenks (fourth niece)
Friends: Victor Rodenmaar Jr.
Mr. Eric Sweet
Enemies: Sibuna
Series Information
First appearance: House of Rendezvous / House of Rescue
Last appearance: House of Hush / House of Spies / House of Sting / House of Never / House of Forever
Portrayer: Michael Lumsden
Frederick Mercer, also known as Mr. Mercer, is Joy's dad, Willow's fourth uncle, and a member of the Secret Society.


According to Alfie, he saw Mr. Mercer down in the cellar when he went back down to get his mask and got trapped. He is Joy's father. Every member in Sibuna, except for Alfie of course, were unaware that he was a member of the Secret Society until  Alfie told Patricia that he saw him in the cellar as mentioned above and when Joy told Patricia about her suspicions when they video chatted on Victor's laptop. They were not completely 100% sure until the Season Finale of Season 1.

Frederick and Victor stalled Sibuna in their search for the cup and answers by showing them that Joy is "safe" in a video-chat and that the teachers were protecting her and her family from Rufus Zeno instead of keeping Joy hostage. However, when Patricia went to talk to Joy in the middle of the night, she learns that Joy was really gone because Mr. Mercer, as well as the rest of the Secret Society, believed Joy was the The Chosen One, and they needed her to help them become immortal. The Secret Society probably only allowed him to be a part of the society because they believed that Joy was the Chosen One and they needed to persuade him with something. Also they probably recruited him because they didn't need him and Joy's mother asking questions about her mysterious disappearance like Patricia did. 

He is the only character who only appears in Season 1, excluding Sarah Frobisher-Smythe, to be mentioned in Season 3. He was mentioned by Joy when she was talking to Jerome. She said that she was still struggling to get along with her dad after he betrayed her the way he did. 

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