阿莱克斯霍诺德带领一支探险队前往格陵兰岛，攀登 4,000 英尺高的巨大海崖，调查气候变化对该地区的影响。

当热衷于研究攀登历史的年轻攀登者乔丹·坎农（Jordan Cannon）与优胜美地大岩壁攀登先驱、传奇人物马克·赫登（Mark Hudon）相遇时，他们围绕着一个共同的目标结成了一种不可思议的忘年交伙伴关系。乔丹和马克最终花了一年时间，冲击了一条对于马克来说充满意义的大岩壁攀登线路，他们的友谊跨越年龄和攀登本身。

Four incredible new films in a special event hosted by Alex Honnold. In Black Ice, a crew of aspiring ice climbers from the Memphis Rox gym travels to the frozen wilds of Montana, where mentors Manoah Ainuu, Conrad Anker and Fred Campbell share their love of winter adventure in the mountains. In Action Directe, French powerhouse Melissa Le Nevé spends seven years battling insane moves, inner doubt, and the burden of history to climb the most revered sport route on earth. First Ascent Last Ascent features best friends Hazel Findlay and Maddy Cope who journey to the rocky outer reaches of Mongolia, on a quixotic search for new trad routes. And Deep Roots, Lonnie Kauk's personal journey to honor his indigenous Yosemite roots, and to connect with his legendary father by repeating his iconic climbs.