马丁（Michael J. Fox 饰）才回到现实世界与女友团聚，布朗博士（Christopher Lloyd 饰）就心急火燎地把他们带到了30年后的未来世界，原来这一次是马丁未来的两个孩子因参与抢劫锒铛入狱，博士要携马丁一起阻止悲剧发生。 周旋一番后，两个孩子被成功挽救，但三人回到现实世界后，却发现周遭发生了天翻地覆的变化，世界被贝夫（Thomas F. Wilson饰）所控制，马丁的父亲乔治惨死，母亲洛莲（Lea Thompson 饰）竟然成了贝夫的妻子！ 这一切都是因为时光机器的秘密不慎被未来的老贝夫识破，他偷偷回去捣鬼，竟因此使得整个世界都在他的掌握下！马丁与博士再次踏上时光穿梭的征途，希望将世界扳回正轨。
In Season Two of The Rings of Power, Sauron has returned. Cast out by Galadriel, without army or ally, the rising Dark Lord must now rely on his own cunning to rebuild his strength and oversee the creation of the Rings of Power, which will allow him to bind all the peoples of Middle-earth to his sinister will. Building on Season One’s epic scope and ambition, the new season plunges even its most beloved and vulnerable characters into a rising tide of darkness, challenging each to find their place in a world that is increasingly on the brink of calamity. Elves and dwarves, orcs and men, wizards and Harfoots… as friendships are strained and kingdoms begin to fracture, the forces of good will struggle ever more valiantly to hold on to what matters to them most of all… each other.
