This if a fantastic documentary well worth watching. It tells the story of WW2 largely from a Soviet perspective. It''s very useful as a source as it is free from the anti-Soviet bias of Western historians and who deliberately underplay the significance of the Soviet role in the Allied victory. British historians are particularly guilty of exaggerating the British contribution to the war effort by focusing on things such as the war in North Africa (despite the fact the Germans only deployed a tiny force there) and the Arctic Conveys (this aid was a tiny fraction of what the USSR supplied themselves and a lot of the British aid was of very dubious value).
I think there are 14 parts in total and the first one is linked