After the Battle of Yavin and the destruction of the Death Star, the War was supposed to end. Yet the Galactic Empire is vast and full of terrors. Rumours of another super-weapon were heard surreptitiously across various hives of scum and villainy within the galactic underworld.
And of course, the legendary Bothan Spynet also got wind of this information at the cost of several heroic sacrifices.
Now your team of rebels, part of a newly-formed specialist strike-force, has been sent undercover behind enemy lines to link up with other outcasts and infiltrators on a mission of vital importance.
Mon Mothma personally believes in you, so it is hoped that you make it back alive with the assets to defeat the Empire for good.