Black scorpi
From Tardis Wiki, the free Doctor Who reference
Black scorpi were scorpion-like creatures native to an Earth-like planet. A swarm of them attacked a plantation and began eating all the crops, but the First Doctor created a chemical rain which not only killed them off, but also accelerated the growth of the plants the scorpi had eaten. (COMIC: Plague of the Black Scorpi [+]Loading...["Plague of the Black Scorpi (comic story)"])
