Plot summary
The team splits up, with Coulson and Morse leading a group to begin searching for the hidden city under San Juan, Puerto Rico, and May, Skye, and Hunter leaving to help Agents Sam and Billy Koenig rescue Raina from a Hydra kidnapping attempt in Vancouver. Raina tells Skye that they are two of the "worthy ones" who could enter the temple in the city and that any others who try will die. She also reveals that the city and Diviner were created by the Kree. Skye tries to warn the main team, but Whitehall blocks their communications as Ward boards the Bus to take Raina.
He also takes Skye, promising to take her to her father and, in exchange, agrees to let the others go. Mack has already entered the city, which causes him great pain and compels him to attack the others until he is subdued by Morse and falls down a deep shaft. Whitehall, surprised to learn that Ward took Skye and did not destroy the Bus as ordered, gives Agent 33 (who still has May's face, but is now disfigured) orders to do so.
Credits
Adapted from Wikipedia contributors, Agents of S.H.I.E.L.D. season 2. HTML formatting and reference markers removed.