１００年以上前、人間を捕食する巨人が現れ、人類のほとんどが食べられてしまった。生き残った者たちは巨人の侵攻を阻止すべく巨大な壁を３重に作り上げ、壁の内側で暮らしていた。エレンやミカサもそんな中の一人だった。そんなある日、１００年間壊されなかった壁が巨人によって破壊されてしまう。

A story about four British scientists who have created a probe which will take a seven year long trip to the largest moon orbiting Saturn, Titan. Designing and building a vehicle that will travel more than 2 billion miles across space is not an easy task as it is shown in Destination Titan. The documentary follows the story behind the creation of a probe that is the culmination of a lifetime endeavor which will be strapped onto what is essentially a giant bomb and hurled out of earths atmosphere on a seven year long journey. will they succeed? This documentary is presented by John Zarnecki and features the famous TV host and astronomer Patrick Moore.