This video shows what happens for the alternate ending or bad ending if you will. The bad ending transcript is below.
'Then half of this world is thine, half of the darkness, and...'
'If thou dies I can bring thee back for another attempt without loss of thy deeds to date.'
'Thy journey is over. Take now a long, long rest. Hahahaha....'
*game glitches on red screen*
Super Mario World Special World in 6:20 - https://www.youtube.com/watch?v=GRyvj31Qjp4