From Wiki

Lyrics

Welcome kids
Now we're going to take you on a fantastic story
Let us journey to the cave of monsters
Let's try and challenge
Cave of monsters
Cave of monsters
Cave of monsters
We are on a fantastic journey to a cave of monsters
Let us try to challenge
Cave of monsters
Cave of monsters

Notes

The lyrics are based on the introduction to Bubble Bobble. The song samples the Charge Beam sound effect from Super Metroid.