UXB (S05E07)

Colin stumbles upon an unexploded missile hidden in the basement and attempts to alert Gordon, but Gordon brushes him off, insisting he handle his issues independently. As Gordon continues to pack for his move to Brussels, Colin gets struck on the head by a croquet ball thrown by Gavin and Tim, leading to him being rushed to the hospital. Unbeknownst to anyone, Colin had placed the missile inside the racket box, and while he tries to warn everyone, the group is too preoccupied celebrating their new beginnings.