Star Trek Expanded Universe
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Officially, Irina Nielsen was the Chief Flight controller of the Sovereign-class starship USS Yagami. Unofficially, she was a member of the Omega Force, a highly-trained team of Starfleet officers whose primary mission is to handle cases involving the Omega molecule and other matters where a fully-crewed starship is inappropriate.

Irina is not the first member of her family to serve in Starfleet. Her great-grandmother, Kelsi Nielsen, also served in Starfleet in the mid-23rd century.(Star Trek: Omega Force)

Service jacket

Background

Through photo manipulation, Lieutenant Nielsen is played by Olesya Rulin, the actress who played Kelsi Nielsen in the first three films of Disney's High School Musical franchise. Elements of Rulin's life, such as her birth date (March 17) and birthplace (Moscow, Russia) were integrated into Irina's own background.

The reference to the Star Trek universe Kelsi Nielsen being Irina's great-grandmother was created to explain the usage of a photo of Olesya Rulin for both characters.

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