Zarkov's rocket ship is a homemade rocket, invented by Dr. Hans Zarkov. Zarkov was criticized by his colleagues for thinking that he could build a rocket that would fly to other planets, but it turns out that he was right the whole time. The ship makes it to the planet Mongo on its first try. Zarkov's rocket is filled with gauges and dials, and there's a big contraption in the middle that sparks. There is comfortable seating for three. Oxygen is provided from a tank situated near the main control bank. The oxygen must be turned on by hand, during flight. ("Chapter 101: The Planet of Peril")