The Polka-dotted alien was a minor alien being that occurred in one Sunday strip. In the strip, Spaceman Spiff was flying his spacecraft through space and landing down on a planet, when all at once, the alien just appeared and startled Spiff. In actuality, it was only Miss Wormwood yelling at Calvin for zoning out.
The alien has a large hippopotamus-like body with flamingo-pink skin and deep purple spots. It has four orange tendrils around its head, eyes on short stalks, and a big mouth full of long pointed teeth.