Looks like you have mostly 2nd issue masks with the longer shoulder pieces. I suppose these were added to keep the masks from being choking hazards? Most of the figures are series 1, and 3 are from the adventure packs (carded figure with mask and accessory), and one 2nd series guy (the Billy Idol clone in picture 1 on the far right).
The little guy is Scott Trakker who came with the infamous T-B.O.B.
Thanks Chris ...I really has no idea about the story line of these guys...the vehicles are really cool though...
I think I meant I had no idea...lol