After a battle with one of the fake Bowsers in Super Mario Bros the Lost Levels Mario is in critical condition currently slowly dying this has trapped him in a coma that is basically a nightmarish version of Super Mario Bros 2 where there are a bunch of different threats but one thing keeps persistently following him Deathbed who takes the form of all three four playable characters in Super Mario Bros 2 just with a gray outline and pale white eyes eventually after beating wart instead of the Game ending deathbed appears again specifically taking the appearance of Mario before grabbing him and proceeding to show him what has happened to him revealing that deathbed is a A sort of part of Mario attempting to help him finally accept what has happened to him and move on to the afterlife away from The Nightmare he's in taking the form of Peach Luigi and Toad he recites their final goodbyes to as he turns back to his true form the Mario one and takes Mario's hand walking into the white void of the afterlife (better Image of him https://www.pixilart.com/art/deathbed-mario-form-sr23d93ab25ebaws3?ft=user&ft_id=1812311 )