Godzilla (Japanese: ゴジラ, Hepburn: Gojira) is a Japanese giant monster, or kaiju, franchise centering on the titular character, a prehistoric reptilian monster awakened and powered by nuclear radiation. The films series are recognized by the Guinness World Records as the "longest continuously running film series", having been in ongoing production since 1954, with several hiatuses of varying lengths. There are 38 Godzilla films: 33 Japanese films produced and distributed by Toho Co., Ltd., and five American films; one by TriStar Pictures and four films (part of the Monsterverse franchise) by Legendary Pictures.