Who where the great powers during World War 2?

The Soviet Union (who began on the side of the Axis Powers then later joined the Allied Powers after Hitler launched an attack on her)

The United States (Allied Powers)

Great Britain (Allied Powers)

Germany (Axis Powers)

Japan (Axis Powers)

Italy (Axis Powers)

France was also involved as one of the Allied Powers but ended up not being much of a great power after she was overtaken and occupied by Germany near the beginning of the war.