Giant Robo: The Day the Earth Stood Still(ジャイアント・ロボ - 地球が静止する日Jaianto Robo - Chikyū ga seishi suru hi) is an original video animation series written and directed by Yasuhiro Imagawa (G Gundam, Seven of Seven), and inspired by Mitsuteru Yokoyama's manga series of the same name. The OVA is recognized for its "retro" style and operatic score. The character designs emulate Yokoyama's drawing style and the mechanics are inspired by steampunk literature. The action setpieces are influenced by Hong Kong action cinema, specifically the new school of wuxia and the 1970s kung fu wave.