In Batman: The Dark Knight Returns, the Batmobile has been modified into a tank-like armored riot control vehicle, complete with machine guns shooting rubber bullets, a large cannon mounted on the front, and large tank treads in place of tires. According to Batman's narration, the only thing that can penetrate its armor "isn't from this planet. " Batman also mentions that it was Dick Grayson who came up with the name. The tank-like vehicle appears to take up two lanes of traffic on a normal road, evidenced when returning from Batman's initial fight with the leader of the Mutants, and thus is too big for normal land travel around Gotham. In the scenes prior to Batman's last stand with the Joker, Batman uses a motorcycle to traverse the city, using the tank again after the attempted nuclear strike and fires in Gotham, although it is torn apart during Batman's battle with Superman. This Batmobile reappeared in All Star Batman and Robin the Boy Wonder #4, which shows its construction by robots in the Batcave.