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space tug is a type of spacecraft used to transfer payloads through space. In episode 1101 Reptilicus Jonah Heston flies in a Class 3 Space Tug called a Backjack, transporting a cache of precious meteors for Gizmonic Institute before he is trapped by Kinga Forrester.

In real life, the term space tug refers to spacecraft used to transfer payloads from low Earth orbit (LEO) to higher-energy orbits such as geostationary transfer, lunar transfer, or escape trajectory. The term is often used to refer to reusable, space-based vehicles, such as NASA's 1970s STS proposal.