Whenever we were faced,
With the dangerous obstacles that filled this place,
You took the shots, told me to stand back,
Out of the line of attack,

I promised to set you free,
You and I and cake, we were meant to be,
Never asked for anything in return,
But then I left you to-

Burn, my Companion Cube,
How could I do this to-
You never did me wrong,
But now I'm alone and you're gone,
You're gone, You're gone, You're gone,

My heart was racing from the start,
From your perfect sides to your little pink hearts,
You're nothing like the other squares,
No one will ever compare,

Oh, my Companion Cube,
How could I do this to-
You never did me wrong,
But now I'm alone and you're gone,
You're gone, You're gone, You're gone,

If I could I'd take it all back,
Live forever with you instead of livin' in regret,
I've lost my best friend,
My heart's at its end,
You always believed in me,
I've abandoned you, it's now that I see,
All that I've done,
In the end, Aperture Science has won...

Oh, my Companion Cube,
How could I do this to-
You never did me wrong,
But now I'm alone and you're gone,
You're gone, You're gone, You're gone,

Oh, my Companion Cube,
How could I do this to-
You never did me wrong,
But now I'm alone and you're gone,
You're gone, You're gone, You're gone