《假面骑士Build：只有一个答案 剧场版》是由上堀内佳寿也执导，犬饲贵丈,赤楚卫二,高田夏帆,武田航平,水上剑星,前川泰之,泷裕可里,越智友己,小久保丈二,木山廉彬,胜村政信,藤井隆,松井玲奈,池田沙绘美,吉田爱梨,内村麻美主演的科幻片。该电影于2018年在日本上映。故事从战兔在公路上骑着摩托车，接到美空和纱羽姐的电话开始。万丈去参拜香澄（女朋友）的墓，一海去参拜三羽鸦的墓，幻德则睡觉。三都的知事的演说开始了，战兔将一对姐弟从Smash那解救了出来。因为伊能贤吾的洗脑，民众们向战兔袭来。火星灭亡后，为了毁灭地球，Blood族在这10年里，一直作为影子暗中活动。Evolto因为没参与其中，导致三人被灭亡。战兔在逃跑的途中，突然出现了两只狗，看到狗实在太可爱了，战兔忍不住为其拍照。结果不巧被民众发现了 ······
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