 The character of Topanga debuts, played by Danielle Fishel. She was  never supposed to have that role. In that episode, there were two  classmates who were giving a presentation in class. One of them was  Marla Sokoloff and the other was a blonde girl named Megan Parlen.  Danielle was supposed to be Megans role, but producer Michael  Jacobs was so impressed with her that he gave her the role of  Topanga the night before shooting the episode. She became a regular  character during Episode 8.