Challengers of the Unknown #7 (1959)

An explorer calls on the Challengers to help him subdue three alien creatures: a giant armadillo-like creature, a giant jelly-fish, and a giant fire-breathing bird. Using their various skills and tools at their disposal, the Challengers manage to capture each one. After all three creatures are captured, aliens from Pluto arrive, and apologize for the creatures being set loose on Earth, and thank the Challengers for recapturing the monsters for them, before leaving Earth.