Detective Comics #277

When a spaceship crashes near Gotham City, Batman and Robin find an injured alien explorer who explains that he had captured a Kraal, a creature that can exist as one or three separate entities. The alien informs the duo that individual Kraals can absorb electricity, heat, and water, but he passes out before telling them what happens with the three are joined. Batman and Robin capture the first two Kraals, the alien recovers and seems intent on joining the three together. Batman determines that when combined the Kraal becomes a powerless creature, and helps the alien complete his plan.