Protectobot Combiner Upgrade
Defensor Upgrades: New chest plate, feet, forearm, and shoulder parts. Forearm and shoulder parts can become Blades and First Aid alt modes. A motorcycle front can be attached to the leg to give the appearance of having Groove, even if you don't have that figure.
Defensor Upgrade 2.0 is an updated version of Defensor Upgrade (no longer available). A new giant weapon has been added and First Aid arm/vehicle mode have been changed and can roll.