Haha nice concept, instead of going for the usual boring "you are in an island.." routine you picked an apocaliptic one. Kudos for that! So here is my list

Exodus - Bonded by Blood (This must be my most listened album of all time and it never ever gets old.)


Iron Maiden - Iron Maiden (Their first and if you ask me the best album. This is basically what got me into metal and I can listen to this every day.)


Metallica - Kill Em All (Their rawest first album and my fav of them. Every metal album like this should have at least one of their first 4 albums if you ask me )


Manowar - Sign of the Hammer (Never gets old. Manowar is one of my early favorites and still is!)


Dio - Holy Diver (Its Ronnie James Dio! Do I need to say more?)


These are in no particular order, they all have exactly the same importance for me. Also noticed after I finished the list: Most of them are the first albums of the bands. Dont know what may come out of that