Laurie Metcalf is set to guest on CW’s Supergirl next year.
Metcalf is set to play Winn’s estranged mother in episode 3.15 which will air sometime in 2018. Very few mentions of Winn’s mother have been made apart from some discussion when his father the Toyman appeared in Season 1.
Apparently the casting stemmed initially from Metcalfe’s daughter adoration of Supergirl star Melissa Benoist which the actress shared in a recent Vanity Fair interview. Best known for playing Roseanne‘s Jackie Harris from 1988 to 1997 more recently she is known for her recurring role in The Big Bang Theory as Sheldon’s mother.