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. As the recruits make their way to base, they are faced with initiation and their first brutal challenge: repelling out of a military-grade helicopter. Later, the recruits get a taste of what it's like operating behind enemy lines as they carry supplies weighing 800 pounds in sweltering 100-degree heat.