Zokbar-2 is an alien that captures spiff, along with one other unnamed alien. The aliens' intent is to force feed him some "putrid" pasta. Spiff escapes after tricking the aliens, likely into thinking that there was someone behind them, however, it only shows the counter part, so it is not clear how Spiff did this.
In real life, Zokbar-2 is either Calvin's mother or father. It is not clear which.