A lot happens, but it can all be summarized very quickly: Kaliko takes West, Ojo, Reigh, and Patchwork to the Nome Kingdom, and puts them in Dorothy's house. Dorothy, Toto, Scarecrow, and Roquat find the shortcut tunnel, but something goes wrong and they find Dorothy's house, with the others inside. Guph comes by, snatches Roquat, gives back Dorothy's journal, and says, "Go forth!" Cue theme song and credits for a cliffhanger ending!
We do get some nice callbacks to events from the books. Kaliko takes West and company back to the Nome Kingdom in a souped-up version of the Gump, powered by the Powder of Life. The titular shortcut is reminiscent of the Nomes' tunnel under the desert in The Emerald City of Oz. This version of the tunnel, however, was a cooperative effort between the Emerald City and the Nomes, however, which leads to the revelation that relations between the two soured after the Wizard stole the Nome King's Magic Belt. Yup, they're going that route!
I'm curious to see what happens in the next episode, and just where the next magic cyclone is going to take everyone. I have a sneaking suspicion they're eventually going to get back to Oz, however.