Twelve years after “Alias” ended, Jennifer Garner says she still feels “so attached” to her character Sydney Bristow.

“First of all, she defined me to the world. But she also defined me to myself,” Garner says during an appearance on “Good Morning America” on Monday. The actress played the international spy for five seasons on the show created by J.J. Abrams.

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“I became more powerful because of her,” she continues. “I became more empowered because of her. I felt stronger, smarter. I learned how hard I could work.”

Garner reveals she has also kept in touch with her “Alias” family, catching Victor Garber in “Hello, Dolly!” on Broadway and seeing co-star Ron Rifkin recently. “We’re all still so, so tight. And J.J., of course,” she adds.

When asked if there’s any chance of an “Alias” reboot, Garner plays coy, telling “GMA” co-host Robin Roberts, “You have to talk to J.J.”

“I don’t know if I can still do it!” she jokes. “It was so hard.”