MTV is going to new heights for the documentary “Summit on the Summit.”Cabler will capture the quest of a handful of actors and activists who will begin Thursday to scale Mount Kilimanjaro, the highest point in Africa. The 90-minute doc will air March 14 at 9 p.m. Seven-day event is meant to raise awareness of the global clean water crisis, among other social causes. Participants include Jessica Biel, Emile Hirsch and Grammy-nominated musician Kenna, who organized the climb. Radical Media, Procter & Gamble and Fury League will produce the docu for MTV.