When Sheldon learns of a change in his living arrangements, he decides to revert back to a simpler time before he met Leonard or Penny.
Leslie appoints Ann as her new campaign manager, but her attempt to relaunch the campaign goes off to a horrendous start, while Chris discovers that Ben is depressed after leaving his job.
Coulson’s life or death is the challenge the team is in, as the wrong decision will cause the destruction of Earth.