In his metaethical treatise Principia Ethica, G.E. Moore argued, among other things, that goodness is the foundation of ethics and thus of ethical theory. But he also argued that 'good' can't admit of definition and that the property of goodness is an irreducible, sui generis feature of the world. In this inaugural episode of Philosophy with Many Gaps, I discuss the arguments Moore provided for the semantic and metaphysical claims noted just above.