I'm pretty sure you're looking for Joe Rogan, the "comedian", "actor", and UFC fight commentator. He brings this up in the context of his DMT trips.
Rogan's notion is a result of his drug induced mystical experiences. The Stanford Encyclopedia of Philosophy gives the following general definition of mystical experience:
A (purportedly) super sense-perceptual or sub sense-perceptual experience granting acquaintance of realities or states of affairs that are of a kind not accessible by way of sense perception, somatosensory modalities, or standard introspection.
Judging what little I've heard from him, this is essentially what Rogan is after.
Insofar as you're mostly concerned with the question of perception, Hume poses relevant philosophical questions in §II of An Enquiry Concerning Human Understanding. (E.g., "The Missing Shade of Blue", which might suggest that we could infer the presence of such a being without being able to sense it.) To explore contemporary philosophical treatments of this field, look to philosophy of perception.
Insofar as you're more interested in the mystical dimensions of the notion, William James' Varieties of Religious Experience is probably the best place to start; it is a seminal text for modern philosophy of mystical experience, and is a joy to read. Perusing the above linked article on SEP will indicate directions in contemporary philosophy.