Return of the Jedi: Original Teaser Trailer (1982)
This trailer for Return of the Jedi is identical to one released earlier in 1982, with one exception: it features the movie's new title and logo. Famously, the film was originally called Revenge of the Jedi until George Lucas opted to change the name, noting that revenge is not the Jedi way.
The trailer features glimpses at many of Return of the Jedi's action setpieces, including the Battle of Endor, the speeder bike chase, and the attack on the Death Star. It also keeps some things secret; neither Jabba the Hutt nor the Emperor are included.
Interestingly, the trailer shows Luke Skywalker wielding a blue lightsaber -- in the final film, his Jedi weapon would have a green blade, resulting in a more visual pop against the blue sky background seen during the attack on Jabba's sail barge. Also included is a quick shot of Obi-Wan Kenobi before "spirit" effects were added.