Janelle is a recurring character in the Disney XD series Lab Rats. She is Leo's girlfriend and primary love interest. Though she likes Leo for who he is, Janelle's can become controlling of him because of her past experiences with his dad's inventions. She sometimes considers him bad luck because he put her life in dangerous situations.
Janelle is Leo's crush, girlfriend, and future wife in alternate timeline (Back From the Future). She sometimes appears to be charmed by his intentions, but most of the time, Leo makes her puzzled by his actions. As of "One of Us," it is revealed Janelle and Leo are still dating despite their fight in "Adam Steps Up".
She is portrayed by Madison Pettis.