Calvin has encountered aliens, both in his Spaceman Spiff fantasies and in real life.
- Ankorians (Passive, also Protective)
- Elerians (Neutral)
- Gnolams (Hostile)
- Klackons (Hostile)
- Meklars (Neutral, Hostile to Sillicoids)
- Mrrshan (Mostly Passive)
- Sakkra (Passive)
- Silicoids (Neutral, Passive to Sillcods, Hostile to Zorks, Zorgs and Meklars)
- Silicods (Neutral)
- Zokians (Unknown)
- Zorks (Hostile)
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