This article originally appeared on www.mcgilldaily.com.

Are extraterrestrials real and present on Earth? They certainly are in the eyes of retired McGill psychology professor Don Donderi. In a talk given to the St. James Literary Society on September 26, Donderi laid out his theory on the presence of extraterrestrials on our planet. However, it seems there may be holes in his theories.

“Some of what people report as UFOs [unidentified flying objects] are extraterrestrial vehicles [ETVs]. Some ETVs have extraterrestrial crews. And some of those ET [extraterrestrial] crews catch and release people, to study us,” Donderi said at the talk. A rather remarkable claim, to be sure, but Donderi, author of UFOs, ETs, and Alien Abductions: A Scientist Looks at the Evidence, offered up a neat set of evidence. His evidence rests on a series of touchstones, or commonalities, between tales of UFO sightings and alien abductions.

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