 A speculative explanatory model for the bizarre, yet frequently recurring visionary experiences available via high-dose tryptamine drugs like DMT, ayahuasca and psilocybin is presented, based on the latest theories in neurophenomenology and bio-evolutionary research.Lundborg's Unified Psychedelic Theory (UPT) ties together the unbiased, phenomenological approach to psychedelic states with anthropologist Michael Winkelman's neuropsychological model of altered consciousness and Paul MacLean's triune brain, and adds a suggestion that several of the more enigmatic aspects of the higher psychedelic states can be explained via residuals of ancient evolutionary responses to genetic matter of a cosmic origin, what is known as panspermia.The UPT hypothesis solves several lingering questions around the recurring contents of the psychedelic experience, the tryptamine spectrum in particular.