Penelope (Leslie-Ann Huff) is the hidden main villainess of the 2010 one-hour episode "Sonny With a Secret" on the TV series "Sonny With a Chance". She first appeared as her assumed name Marta Balatico in the 2010 episode "The Legend of Candy Face" and was the co-star of Sonny's Monroe's former nemesis turned lover Chad Dylan Cooper.
She was partnered with Nico Harris in the episode "The Legend of Candy Face". Like the rest of her Mackenzie Falls castmates, Marta despises the sketch comedy show So Random!. But in "Sonny With a Secret", she's revealed to despise Sonny the most for dating her crush, Chad Dylan Cooper. Nico is shown to have a crush on Marta, but she doesn't like him. She always tells Nico that she is way out of his league, but he doesn't stop flirting with her. Penelope is highly cunning and crafty, for she devised a way to get Sonny kicked off of So Random!. By sending Sonny a hate cake which read "Sonny Munroe is a Phony" and making it seem like she stole a necklace from the mall, Nico and Grady Mitchell's golden coin, and the So Random! character Sicky Vicky, Marta was able to get her fired. Marta even seems willing to kill for her desires, because she replaced Sonny's cheese ball with a bomb that would explode when Sonny fired it from the cheese cannon. She also trapped Chad, Nico, Grady, and Zora Lancaster on an airplane that was about to crash. She was willing to let Chad escape the plane with her, but only if Chad would date her. When he refused, she jumped off the plane and took the only parachutes with her, without seeming to feel any guilt.
Luckily, Grady had a parachute on him because his mother advised him to never get on a plane without one. They all jump together on the same parachute, although it rips on the way down due to their weight. By luck, they survive the fall and land next to Tawni's car. In the end, Penelope was caught by Tawni and arrested for her misdeeds. Currently, she's off of MacKenzie Falls, and serving a life sentence for attempted murder.