http://marvel.com/news/tv/24095/declassifying_marvels_agents_of_shield_aftershocks Official synopsis of the midseason premiere + the back half of the season Also interesting to note is that Adrianne Palicki is now a series regular as Mockingbird, while Henry Simmons remains as a guest as Mack. Kyle MacLachlan (Mister Hyde), Ruth Negga (Raina), Dichen Lachman (Skye's mother Jiaying) and Simon Kassianides (Bakshi) are guests, so it'll be interesting to see what happens to Bakshi. I think Bakshi is the "traitor in SHIELD's midst" thing. Also guests for the back half: Blair Underwood as May's ex, Dr. Andrew Garner http://marvel.com/news/tv/23805/blair_underwood_joins_marvels_agents_of_shield. Edward James Olmos as Robert Gonzales who "will have massive repercussions for Director Coulson and his team." http://marvel.com/news/tv/23908/edward_james_olmos_comes_to_marvels_agents_of_shield. Luke Mitchell as an inhuman named Lincoln http://marvel.com/news/tv/24049/marvels_agents_of_shield_adds_luke_mitchell Jaimie Alexander as Sif http://marvel.com/news/tv/24063/the_lady_sif_returns_to_marvels_agents_of_shield. Drea de Matteo as Karla Faye Gideon, a Gifted who allies with Mister Hyde (also worth mentioning is she's a minor character from Daredevil comics) http://marvel.com/news/tv/24082/drea_de_matteo_turns_villainous_in_marvels_agents_of_shield.