Isaac being the spawn of Satan, or some other kind of demon, is supported by the ending unlocked by beating the Cathedral.What's in the chest, the same sort of chest that's found in the Womb? A chance to start over - Isaac can either keep his current life or try a new one (he chooses the latter).įorget ' Bad Future' - Isaac doesn't even want his Bad Present.

which cycles through all the personas he has taken and returns him to his room. In the end, Isaac has a showdown with Satan and finds a final chest. If we assume he's the spawn of Satan, it explains the offers and why he fights him at the end - it's a battle for control over his destiny. Every power-up mutates Isaac as well, representing future versions of him. XXX/? the Dead Baby - to whom Isaac reacts in absolute horror - is obtained AFTER YOU KILL ISAAC'S FETUS FORM. Every form of Isaac is him dressed as a potential version of Isaac in the future. Isaac is an abused, unwanted child, and/or the spawn of Satan - Either way, he wants to return to the womb and start over.He's naked.