HYDRA was within SHIELD. Coulson's team retreats to a secret SHIELD base. While at the base the team come across some familiar faces: Agent Hill, Captain Rogers, Romanoff and an injured Nick Fury. They ultimately have to team up together to defeat HYDRA within SHIELD. However, along the way relationships are explored and friendships are tested. Daisy and Ward? or Daisy and Simmons? Hill and Romanoff? or Hill and Rogers? Mack and Morse? or Mack and Yo-Yo? MARVEL own all characters.