Ballpoint Pen - S1.E11

It's the day of the Great Ballybeg Race and Lir says Garth and Bev can compete this year. Trouble is the flags they've used to mark the route keep going astray and pretty soon, everyone is completely lost! When the children figure out that using a big muddy boulder to make a nice clear track, Lir sends them to visit Laszlo Biro in Budapest to see his invention; The Ballpoint Pen.