Charles Widmore
After Ben was taken into custody by Martin Keamy (Kevin Durand) and the mercenary team sent to the island by Charles Widmore, Alpert captured Kate and Sayid to enlist their aid in retrieving him in part 1 of "There's No Place Like Home". In part 2, Ben was rescued and Keamy was shot several times by Alpert; Keamy's bulletproof vest saved his life. Once Ben ventured to the Dharma station called the and moved the island, time began skipping for the survivors while Alpert and the Others remained in the present.