Gero and Chipo were a father and son who farmed a field in Kenya around 2011. They were chosen to test an experimental fertiliser developed in the tropics with high bio-enhancing hormone levels. Although the fertiliser had the desired effect on the crop, almost ready to harvest in a few weeks, there was an unfortunate side effect in that the natural wildlife (especially the hornets in a barn) also saw a rapid growth development. What was overlooked was the lack of water (i.e. rain) in the air that diluted the chemical in the tropics. The Eleventh Doctor, Amy Pond and Rory Williams had arrived at the right time and the Doctor used the TARDIS weather control system to create a localised rain cloud that reversed the effects on the hornets. (COMIC: Buzz!)
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