Galaxy Express 999 S01 E46 The Song of El Alamein

Nanmi, a passenger on the 999 is able to convince the train to head to his planet, El Alamein, when he threatens to kill Tetsuro. Once they arrive Tetsuro and Maetel travel outside with him. The planet is mostly a desert, with many inactive tanks lying around. Sensing their life however, the tanks come back to life and attack.