What elements are consistent with each session?

A session with multiple players is a collaborative effort to create the players via ectobiology, complete the quest of each planet, defeat/deal with each denizen, breed the Genesis Frog, defeat the Black King before the Reckoning finishes, and finally perform the Ultimate Alchemy. 

A session with one player becomes a quest not to breed a new universe, but to gain unconditional immortality and endless power by completing a series of excruciatingly difficult tasks.