Dedicated man of science Paul Armstrong is in the despairing midst of a two-year lost weekend in the Amazonian jungle. A bitter, drunken mess of his former self, he has all but given up his quest for Geranium 90. Meanwhile, his numbskullian nemeses, including the Lost Skeleton, have been spotted in the area, ready to grab the Geranium for themselves. With the help of Armstrong's unflappable and spot-free wife, Betty, and their irascible alien friends the "Marvins" from Marva, the race to the Geranium is on once again.