Metal Slug Co Op Credits Evolution

Metal Slug 1 offers two different endings, dependent if you end the game with one player or two.
The two player ending is more uplifting and uses a song that you may sing Karaoke stile in the arcade if you dare (the lyrics are displayed on the bottom of the screen).
The Saturn and Playstation ports featured an arranged version that is performed by an actual singer.
Later released versions of Metal Slug 1 did not use this arranged music ever again.
In this video you can watch the different versions of the two player ending.
Peace forever!