"What Happened to Frederick" is the 13th episode of the American fairy tale/drama television series Once Upon a Time, which aired in the United States on ABC on February 19, 2012.
In this episode, David (Josh Dallas) finds his love for Mary Margaret (Ginnifer Goodwin) growing stronger and finally agrees to end his loveless marriage with Kathryn (Anastasia Griffith) by telling her about his secret relationship, and Emma Swan (Jennifer Morrison) becomes more intrigued with The Stranger (Eion Bailey), while Prince James (Dallas) is asked by Abigail (Griffith) to recover something precious that was lost to her.
In the Enchanted Forest, King George's (Alan Dale) men hunt for Prince James (Josh Dallas) who has fled his wedding to Princess Abigail (Anastasia Griffith).
Even though James knows the deceptive nature of the siren, she transforms into the image of Snow White (Ginnifer Goodwin) and attempts to seduce him.
He meets Red Riding Hood (Meghan Ory), who informs him that Snow White left to look for him and tell him she loves him.
Soon after, Kathryn visits and slaps Mary Margaret in the middle of the school hallway and tells the confused teacher that David lied to them both.
Later, Mary Margaret notices people are avoiding her and whispering behind her back, including Granny (Beverly Elliot) who tells her she should be ashamed of herself, revealing that the news of her affair had spread around the town.
The Stranger (Eion Bailey) tells Emma Swan (Jennifer Morrison) his name is August Wayne Booth.
Hours later, as Emma starts brushing leaves off her car, she finds the red metal box that holds Henry's (Jared S. Gilmore) book, while August secretly watches her.
It is discovered by the school gym teacher (who was Frederick (Holt) in the Enchanted Forest), however, Kathryn is not in the crashed car; she is missing.
"What Happened to Frederick" was written by co-executive producer David H. Goodman, and The Shield veteran, Dean White, directed the installment.