when the doctor arrives he plays meglos at his own game and tries a little impersonation. the situation becomes so confused the gaztaks lose track of which one is which, enabling the doctor to change the settings of the super-weapon. meglos abandons the earthling, leaving a bemused man watching a cactus creature reassert himself in his laboratory. meglos knows the doctor has realigned the weapon. the creature is unable to stop the doctor fleeing back to the tardis, taking the earthling with him, and is also unable to persuade grugger not to fire the weapon. from the tardis the doctor and his friends witness the destruction of zolfa-thura, the gaztaks, meglos and the dodecahedron.