The boss fight itself is tricky, as it introduces a new mechanic where the player's soul is split in two and you must move each half independently to the correct positions. You can't actually hurt Mad Mew Mew, and must instead survive long enough to spare Alphys is the head scientist of the monsters underground. She experiments with a human "substance" called Determination. While trying to give monsters the ability to persist in soul-form after their bodies have died, she inadvertently resurrec...