Serial Ape-ist is a low-budget horror movie that Penny did when she first moved to Los Angeles. Its plot involves a genetically engineered and sex-crazed killer gorilla on a rampage. Penny appears in a scene topless in the shower where her character is attacked and killed by the gorilla.

Creators: Chuck Lorre, Bill Prady
Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco

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Penny tells Sheldon about the movie in “The Hofstadter Insufficiency”. She thought that no one knew about the movie since it never came out; however, Howard found it online shortly after the guys met her in the “Pilot “. Even Sheldon had watched the movie. Leonard shows the movie (and his beautiful girlfriend) to his scientist colleagues on his North Sea expedition in the summer of 2013.

In “The Friendship Turbulence”, Penny told the guys she has turned down a part in the sequel to Serial Ape-ist (Serial Ape-ist 2: Monkey See, Monkey Kill). Later when her car breaks down and she needs money, she calls back for the part, but finds out that it has been given to someone else. Later, she is again offered the part and takes it, but is reluctant since the movie is so bad. She seeks the advice of Wil Wheaton who later she finds is in the movie playing an orangutan and her boyfriend/mad scientist. When Penny tries to get the director to have another take on her latest scene he fires her because they don’t need her after that.