Horizon: Playing God, BBC Two, review But Rutherford overcooked it, particularly in his opening gambit - the revelation that scientists have developed a new hybrid breed of "spider-goats." For all the images of giant bleating arachnids the name conjures, they were more innocuous beasts. As such, though their ability to lactate a rare protein used by spiders to create super-strong silken threads was admittedly remarkable, we were left a little disappointed as Freckles, Pudding and Sweetie chomped and grazed around the farm looking for all the world like, well, goats. Cutting-edge science needs to be treated very carefully, Rutherford warned, and for a moment it seemed he was fretting about what might happen if one day the spider-goats turn on us. Instead a shady-looking FBI expert emerged to warn of the threat of "bio-terrorism" - disillusioned teenagers in garages downloading viral DNA and the like. An alarming prospect, though he didn't specify whether the danger was more likely to come from a disgruntled junior member of an oversized family.