Two-part documentary which deals with two of the deepest questions there are - what is everything, and what is nothing? In two epic, surreal and mind-expanding films, Professor Jim Al-Khalili searches for an answer to these questions as he explores the true size and shape of the universe and delves into the amazing science behind apparent nothingness. The first part, Everything...。巴里·艾伦穿越时空回到过去去拯救自己的母亲,但是未来的自己阻止了他。当他回到现在,此时虫洞已经为了第二次穿越时空而重新打开,来自平行世界的极速与巴里展开的对决,极速也道出了他不远万里穿越平行宇宙追杀闪电侠的缘由:为了让自己成为所有宇宙中唯一的极速行者。。