Last season, Marvel's Agents of S.H.I.E.L.D. had a warrior princess on their side in the form of the Asgardian Sif (Jaimie Alexander).
In the mid-1990s, Lucy Lawless led the 'girl power' movement as Xena, Warrior Princess, one of TV Guide's '24 Greatest Action Heroes'. A spin-off of Hercules, the Legendary Journeys, she surpassed both her predecessor and Baywatch as the top-rated show in syndication. For six seasons, Xena and her sidekick/best friend/protege Gabrielle traveled across the world fighting the forces of darkness, while fighting the darkness that continues to exist within her due to her troubled past.
Xena: Warrior Princess marked the return of female action heroes on television since the days of Wonder Woman, The Bionic Woman, and Charlie's Angels.
After hanging up her sword and chakram, Lucy appeared on The X-Files, CSI: Miami and Burn Notice, and had roles on Syfy's Battlestar Galatica, Parks & Recreation, and STARZ's Spartacus.
Her role on Agents of S.H.I.E.L.D. is classified at the moment -- just like S.H.I.E.L.D. itself, which is why Nick Fury is hailed by armored Avenger Tony Stark/Iron Man as 'the spy', for Fury's secrets have secrets.
Agents of S.H.I.E.L.D. begins season two on its new night: Tuesday, September 23 at 9pm on ABC.