The bottom of the box holds a treat - the entire Constructicon team, combining to form the classic Devastator. Predating the more standardized “Scramble City” style combiners which are all 5-bot teams with a larger one forming the torso and four others forming interchangeable limbs, Devastator (who was originally the Diaclone “Construction Vehicle Robo” team) is made of six parts, all of which are unique and have some very weird ad-hoc connection methods. To make it all work they come with a bunch of extra parts, most of which can be repurposed to change the vehicles into “Attack Modes” with oversized weaponry or wings.
The individual Constructicons (L-R: Bonecrusher, Scavenger, Scrapper, Hook, Long Haul, and Mixmaster) are a mixed bag with some having simple, stiff transformations and other being more complex. Putting them all together can be a bit fiddly, but they hold up pretty well once combined (though a few joints on mine are a little loose after 30 years).