Jerry is nanorobotic Core who "employs" Wheatley briefly to help him rebuilding the facility. Jerry is a nanobot thus cannot be seen by the player, but his presence is indicated by a garbled and sped-up voice. When slowing down the voice by 75% and reversing it, it is revealed that Jerry is saying "More tests are scheduled for Tuesday." Jerry then "fires" Wheatley when he accidentally knocks a girder off Chell's elevator and make Jerry mad at him. Wheatley then claims that he has a prejudiced work crew.
Jerry only appears on Chapter 4 "The Surprise"