Although the details of her role haven't been disclosed, TVLine adds that the ABC drama has been searching for someone to play recurring character Mary Maloney, described as a highly skilled S.H.I.E.L.D. agent who can “command any room." It seems likely an official announcement will be made Friday at Comic-Con International in San Diego during the "Marvel Television Presents" panel.
Best known for her starring role on "Xena: Warrior Princess," Lawless has also appeared on the reimagined "Battlestar Galactica," "Spartacus" and "Parks and Recreation."
"Marvel's Agents of S.H.I.E.L.D." returns Tuesday, Sept. 23, at 9 p.m. ET/PT on ABC.