This is actually “Gigantis the Fire Monster” - totally American version
This is not just the original Japanese “Godzilla Raids Again” (1955) but dubbed in English, but is the completely re-done and very different American version, released theatrically in the U.S. as “Gigantis the Fire Monster” (1959). The Americans thought using the name “Godzilla” was somehow not a good idea??!! Even though the American version called “Godzilla, King of Monsters” (1956) and edited in with Raymond Burr was a hit for American audiences. “Gigantis” did not do as well in America. If you want to compare it to the original “Godzilla Raids Again” (1955) in the original Japanese (but subtitled in English), it’s on YouTube at
https://youtu.be/J4JuX6_JNf4 . Oddly, this version says “Godzilla Raids Again” in the beginning, but calls him Gigantis throughout? For a more detailed history, see on YouTube “The History of Godzilla Raids Again” at
https://youtu.be/7OmrU4Xt2ws .