Fireman Sam: The Pontypandy Polar Bear/The Why Files/Three Legged Race/Treehouse Trouble/Ukulele Crazy

Huge footprints in the snow convince Sarah that there's a polar bear in the area. She tries to photograph it for a local newspaper competition. / Norman and Hannah set themselves up as The Why Files - investigators of the mysterious mysteries of Pontypandy. / In the annual three-legged race in Pontypandy Fireman Sam is partnered with a less-than-confident Dilys Price. Norman Price tries to cheat but then hurts his leg. / The Pontypandy Pioneers are working towards their construction badges and what better way to do it than to build a treehouse under the supervision of Mike Flood! / Sarah tries to turn Trevor into a ukulele star with a real live rock video, but when things go wrong, Sam ends up the surprise star of the video.