Billy Chenowith

We're Getting Mutants in the MCU - The Loop

Billy Chenowith
Billy Chenowith.jpg
Portrayed by: Jeremy Sisto
First appearance: "Pilot" (uncredited)
"An Open Book" (psychical)
Last appearance: "Everyone's Waiting"
Status: Alive
Occupation: Artist
Relatives: Bernard Chenowith (father)
Margaret Chenowith (mother)
Brenda Chenowith (sister)
Nate Fisher (first brother-in-law)
David Fisher (brother-in-law)
Claire Fisher (sister-in-law)
Willa Fisher Chenowith (niece)
Maya Fisher (adoptive niece)
Daniel Nathanson (second brother-in-law)
Forrest Nathanson (nephew)
Significant Other/s: Claire Fisher (ex-girlfriend/sister-in-law)

Billy Chenowith is a recurring character who is the son of Bernard Chenowith and Margaret Chenowith and the younger brother of Brenda Chenowith. He was portrayed by Jeremy Sisto.


He and Brenda had a close relationship as children but he was later diagnosed with bipolar disorder and hospitalized.  When released, he showed up at her house unannounced and later attacked her after cutting off his own tattoo and wanting to cut off her matching tattoo, which were the names of literary characters from a children's book.

He was previously in a relationship with Olivier Castro-Staal, who taught him art at college. He meets Claire Fisher in 2001 and the two later become an item but he ceases taking his medication, thus becoming more unstable, which leads to her breaking up with him for her own safety. He pleads with her to take him back but she refuses, even though he goes back on his medication.

When Brenda dies, he is shown by her side complaining about his (now long gone) relationship with Claire.


  • Although absent for the first three episodes of the first season despite having an uncredited role in the pilot, Billy did not become a series regular until the fourth episode.
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