Batman and Robin were in their Batplane when they were transported across dimensions to the planet Xlur. As the scientists of Xlur tried to find a way to return them home, the atmosphere of Xlur transformed Batman and Robin into green-skinned aliens.
The transformation had not worn off by the time the two were returned to Earth, and they had to fight the Yellow Sweater Gang, while having difficulty in convincing their allies that they were, truly, the real Batman and Robin.
