Ilsa Nadir is the main character in the Siberia mission (at Oblask Dam) in TimeSplitters 2. She had been sent to investigate the base and destroy the samples and research records before Biohazard clean-up teams arrived. Just before she arrived, Sergeant Cortez leapt into her body for the purpose of acquiring the Time Crystal stored inside the base.
The daughter of Dr. Katje Nadir, Ilsa knows no fear and will gladly undertake the most dangerous search and destroy missions. Few men can come close to matching her superb fighting and infiltration skills.
Ilsa Nadir makes her sole appearance in TimeSplitters 2. She appears as the lead protagonist in the Siberia mission, but outside of Story mode, she only appears in Bot Sets and nothing more.