Zogs are an alien species in the Spaceman Spiff universe. They live on Planet Zog, but may have colonies elsewhere. Three distinct kinds of Zog are seen, all of them slightly larger than Spiff:

The Zog guard is stout, misshapen and shaggy, with two lifeless eyes on the sides of its gaping mouth. It has six limbs; four arms and one pair of legs. Its back appears to be a shell, with short spines near the base of its neck.

The Zog King, ruler of the Zogs, had Spiff brought before it for interrogation. Rather unlike the zog guard, the king's eyes are on top of short stalks above its mouth. It has at least two tentacles protruding from its body, but it is unknown whether they stand in for arms, legs, or something else entirely. His real-life counterpart was Calvin's doctor.

The Zog slavemaster manages the workers on the Zog slave gallery. Presumably, it does so very harshly, as it was seen with whip in hand. It has a single eye on top of a stalk, and a row of spines traveling down the back of an insect-like shell. This Zog stood in for Calvin's father.