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Natalia first appears in “The Real Thomas", where she is introduced by Benson as his new girlfriend. He says she is a schoolteacher named "Natalie" and announces to the staff that their only jobs are to stay out of his way while he shows his date around the park. Meanwhile, Rigby becomes suspicious of Thomas and eventually convinces Mordecai and Muscle Man after finding a secret room in the AV room where Pops and Skips are tied up. Before they can help Benson, however, Natalia puts him in handcuffs and pushes him into the secret room.
Natalia explains that she's a Russian spy and that one of the park's own staff has been working there undercover for two years. Benson, even more confused, questions who. On cue, Natalia reveals it to be Thomas - whose real name is "Nikolai". Thomas, in a Russian accent, reveals he is a Russian spy as well.
Thomas explains that the parks in Russia are outdated and that Natalia and himself were sent to infiltrate an American park. Natalia announces their new orders from General Romanoff and they depart, taking the park crew hostage. Natalia then reveals to Thomas their true plans: to bypass the U.S-Russia Nuclear Arms Treaty (which calls for Russia to never fire a missile at the U.S.A and vice versa) and bring a part of the U.S to their missile, starting and finishing with the chunk of the park, which would in turn start World War III. Nicolai, completely unaware of this ulterior motive, is horrified as he never intended to hurt anyone. Thomas then realizes that the park was like a home to him and can't go through with the plan. He and Natalie struggle for the remote, during which time Natalia falls out of the open hatch to her death (she is eaten whole by a whale).
When Benson sees her get eaten, he cries out for her (as he believed that they could've worked their issue out), only to be reminded by Mordecai that she tried to kill them.
Natalia is introduced wearing a light blue cardigan over a white shirt and a purple pleated shirt. Her blonde hair is tied back into a pony tail.
After she reveals that she is a Russian spy, Natalia wars her hair up and over her face and changed into a brownish-green suit with a zipper and black high-heeled boots.
- Most of the time, Natalia is seen with lipstick. However, in one scene, it's goofed and she isn't wearing any.
- She appears to be single-minded like Benson. When Thomas came to his senses, she immediately opposed him, which led to her death.
- Her name is a reference to Marvel's Black Widow. Although she has a same voice actor as Black Widow's in post-2011. As Thomas/Nicolai's voice actor did voiced Captain America.
- The Black Widow has also used the names Natalie and Natalia as an aliases, and her real name is usually given as Romanoff - the same as Nicolai and Natalia's Commander.
- Natalia's American alias "Natalie" is a hint at her real name.
- Due to her more villainous roles and having a blonde hair, she shares some similarities as the second Black Widow, Yelena Belova.
- In Marvel Cinematic Universe’s 2018 film Avengers: Infinity War, the original Black Widow dons the similar looks as Yelena.