Nothing like killing two birds with one stone: Joe Johnston drew this concept sketch to go with early drafts of Revenge of the Jedi. But it also illustrates something from the very first draft of Star Wars, which George wrote back in 1974. In the “Revenge” scripts, Princess Leia has various run-ins with some vaguely described “Imperial trackers,” who are also causing problems with the Ewoks and Yussem. Given that Johnston has added forearm guards and a head mask, it’s possible that George Lucas had already envisioned these Imperials seated on rocket bikes (later, speeder bikes). They also had “T-bombs” and a garland of (Ewok? Yussem?) teeth.