At 66° N in the Scandinavian Caledonides, there are three superposed, extremely allochthonous, high-grade-metamorphic, and competent nappes. The present tectonic analysis shows that the middle one, the Krutfjellet Nappe, which is separated from the other two by low-grade-metamorphic and incompetent units, consists of several gigantic, laterally semiconnected, quasi-lenticular parts. These major structures are discussed in their polyphase context, and a pinch-and-swell mechanism is proposed for the generation of the discontinuous nappe; the order of imbrication is also considered. The named and defined allochthonous units, lenses, and folds are the Jofjället Nappe, the Krutfjellet Nappe, the Atofjället Nappe, the Joesjö Nappe, the Tärna Nappe, the Lappland Nappe, the Krutfjellet Lens, the Norra Storfjället Lens, the Södra Storfjället Lens, the Atofjället Synform, and the Jofjället Synform.