1988 saw the debut of the Iron Grenadiers, another evil faction for G.I. Joe to battle, led by the returning Destro. Battle Force 2000 was the G.I. Joe team designed to counter them. Fan favorites Night Force and Tiger Force also bowed this year, cementing the practice of themed sub-teams to fill out the toy line. The sub-teams are truly sub-lines: tied into the greater G.I. Joe toyline, but with unique packaging and designs that help set them apart.