First grab a bomb morph, and detonate Vectorman. Pause the game while Vectorman is still exploding and enter CALLACAB (C A left left A C A B). Unpause the game. Pause again and enter the CALLACAB code. Unpause it, and Vectorman will be invisible AND invicible. Reenter the CALLACAB code to turn it off. No bomb morph is nedded to disable it.