Has four known forms. One used among the standard Agent form used around Warstar, an Earth Armor used around the Mutants, a cyborg form given to him by Metal Alice, and his true form, which appears in Super Megaforce.
Also, Vrak never met Octoroo nor gain a Nighlok form.
Gosei Knight was originally one Brajira's Headders, Groundion.
Has no relations with Robo Knight, though Vrak wants Robo Knight to serve him and he succeeds in doing so in the two parter of Super Megaforce, Vrak Is Back.
Somehow escaped the destruction of the Indevader and released the Yuumajuu.
Was left trapped in the Warstar Mothership as it blew up, though he barely survived; the Toxic Beasts are long gone by this time.
Was imprisoned by his Yuumajuu comrades due to his recklessness when trying to obtain the Abare Headder by himself.
Was never imprisoned by the Toxic Mutants due to him not staying with the toxic beasts for quite a long time.