Tales of the Unexpected #39

Arnald Arnaldo finds a replica of a long lost planet in a Venusian curio shop. While studying it back on Earth, two figures come to life and go on a rampage. After they return to the globe, Arnaldo takes the globe to Mercury, thinking Earth's atmosphere has awakened them, but the process repeats itself there with four creatures coming to life. Arnaldo discovers that the globe isn't a model of Krx, but is the planet itself. Scientists had decided to shrink Krx in size to eliminate the problems it created, but it had drifted off in space before the process was complete.