When Matthew throws his sister the world's worst surprise birthday party, he realises he's got to get to know her better and show her he's a good brother. As Matthew spies on his sister in the name of 'good brother' research, Ben has his own observational study to conduct, having been enrolled on a home education insectology course. Ben bonds with his new stick insect friends who appear to be evolving in front of his very eyes. Tom's birthday party food has proved such a hit he launches his own pop up restaurant in the living room. However, the bond between the boys is tested when it transpires that Tom has an unusual secret ingredient that's transforming his dish. (thetvdb.com)