I'm new to Starcraft and have been playing the campaigns. Right now, I'm in the mood for wanton destruction and the Zerg sound like fun. So with that in mind:
How do I play as the Zerg in Starcraft II?
I'm not asking for advice on how to play them well, but how to play them at all. I played the Zerg a bit in the tutorial and I like the taste. I haven't found any campaigns that allow me to play as them. I found this question, which says there are no Zerg missions.
Is there any other way to play as the Zerg? Any way at all? As I said, I'm new. The only ways I can find to play are campaigns and multiplayer. I don't want to play multiplayer; I'm a casual player who just wants to entertain myself at my own pace.