Rejoice, Xena: Warrior Princess fans! You may have a chance to see Lucy Lawless back in fighting form. While she won't be reprising her famous role, she is reportedly joining the cast of Agents of S.H.I.E.L.D., Joss Whedon's action-packed TV series based on Marvel Comics superheros. Not much information about her upcoming role is known, but we have a feeling she'll be kicking butt. Tune into Season 2 of the hit ABC show when it returns Tuesday, Sept. 23, at 9 ET.