- “Sorry, guys, but you two have put me off dating for at least four years. I think I'll just buckle down and co-produce my Dad's movie.”
- ―Greta Wolfcastle
Greta Wolfcastle is the daughter of famous actor Rainier Wolfcastle.
She is first seen getting bullied by Jackington and two other bullies, who play keep-away with her backpack. She is saved by Bart and they started to go out. After Bart thought that she was becoming too needy, he broke up with her, which led to Greta dating Milhouse to get back at him. Bart, now jealous, planned to do everything he could to win her back and followed her to Canada where he and Milhouse got into a fight during a curling game. In the end, Greta broke up with Bart and Milhouse and agreed to stop dating for several years so that she could co-produce her father's movies. She was later seen standing in line with her dad for ice cream in the episode "Ice Cream of Margie (With the Light Blue Hair)". She also made a cameo in the episode "Special Edna".
The episode where she had a star role is in Bold.
- Episode – "The Bart Wants What It Wants"
- Episode – "Special Edna"
- Episode – "Ice Cream of Margie (with the Light Blue Hair)"
- – The Simpsons Movie (cameo)
- Comic book – Simpsons Super Special 15
- Video game – The Simpsons: Tapped Out
- Despite being a child, Greta could be considered as a direct caricature of her voiceover, Reese Witherspoon, due to her mature attitude and interest in serious romantic relationships.