query: When does the character Zelena first appear on ABC's Once Upon a Time?
passage: Zelena (Once Upon a Time)
Zelena, also known as the Wicked Witch of the West and cursed as Kelly West in the seventh season, is a fictional character in ABC's television series Once Upon a Time. She is portrayed by Rebecca Mader and was first introduced in the second half of the third season. After making recurring appearances in both the third and fourth seasons, Mader was promoted to series regular for the fifth and sixth seasons.[4] She returned as a recurring guest star in the seventh season.[5]
passage: David Nolan (Once Upon a Time)
David Nolan, also known as Prince Charming, is a fictional character in ABC's television series "Once Upon a Time". He is portrayed by Josh Dallas, who also happens to be married to series co-star Ginnifer Goodwin, who plays David's wife Snow White/Mary Margaret Blanchard.