FOX's ultimate celebrity social experiment, Special Forces: World's Toughest Test, returns for a fourth season, enlisting a new troop of household names to endure some of the harshest, most grueling challenges from the playbook of the actual Special Forces selection process. This time around, the recruits will be training in Morocco and will endure the extreme circumstances of urban warfare. New this season, some recruits arrive in pairs consisting of spouses and family members but will compete individually.