The "floating" limb movements were coded in John's first prototype of "Fleapit", with the idea of removing limbs incorporated later on as the Pickfords experimented. The idea of costume and vehicle power-up had also been around since "Fleapit", although the set of power-ups changed with only the helicopter carrying over; "Fleapit"-only power-ups included "Robo Plok," a robot form that improved maneuverability and was inspired by Ro-Jaws from the "2000 AD" comics; "Ninja Plok" which armed him with an endless amount of throwing stars; and "Super Plok," a superhero with flying abilities. Plok also had the "smart bomb," an ability where he enraged himself to the pointing of exploding and wiping out all enemies on the screen (as well as his own limbs).