Anna Milton

Anna Milton is a fictional character portrayed by actress Julie McNiven on The CW Television Network's drama and horror television series ''Supernatural''. First appearing in the fourth season, Anna is a fallen angel who champions humanity over her own kind; because she is fallen, she is a hunted fugitive of Heaven with a death sentence on her head. She is initially an ally to series protagonists Sam and Dean Winchester as well as to Castiel, but becomes an antagonist in her final episode when her method for averting the Apocalypse in the fifth season pits her against them.

Although McNiven received general praise for her debut and chemistry with actor Jensen Ackles, who portrays Dean, critics thought that the character lacked direction in her later appearances and questioned her ultimate betrayal. Provided by Wikipedia