Rowena Maclean was an Inhuman who was a member of HYDRA. While working under Gideon Malick, she underwent Terrigenesis after consuming a fish oil supplement which carried the Terrigen Mist. However, her service to Malick changed when she fell under Hive's sway and served him in his conquest. She was later freed from Hive's control and joined the HYDRA Empire.
Powers and Abilities
As an Inhuman, Cygnus is able to teleport herself and a certain amount of mass that is in contact with her.