'Frankenstein's Monsters: Sanda vs. Gaira') is a 1966 kaiju film directed by Ishirō Honda, co-written by Honda and Takeshi Kimura, produced by Tomoyuki Tanaka and Kenichiro Tsunoda, with special effects by Eiji Tsuburaya. The War of the Gargantuas (フランケンシュタインの怪獣 サンダ対ガイラ, Furankenshutain no Kaijū: Sanda tai Gaira, lit.