Released in 1986, Defensor is the combined form of the five Protectobots: Team Leader Hot Spot, Blades, First Aid, Groove and Streetwise. Being a Scramble-City style combiner means any of the smaller Protectobots can serve as any limb; however, the "correct" configuration has Blades and First Aid as arms, and Groove and Streetwise as legs. Defensor was available as the individual Protectobots sold separately, or as a giftset, and its mold was later redecoed into Guard City.
I am very grateful towards a fellow collector, Eric for helping me find the Defensor giftset in Japan. He actually messaged me while he was in Japan and went out of his way to find this gem of a set, which is mib unused with unapplied stickers. The box is extremely mint with barely noticeable creases. Definitely one of the better sets I have seen in comparison to those listed on online auctions.