Lesson 43: Hapi-Hapi! Merry Christmas, Osu

'''Hapi-Hapi! Merry Christmas, Osu''' is the forty-third episode of Engine Sentai Go-Onger.

Plot
While Christmas shopping, Ken and Bion Biao meet a young American child named Carl who hates Christmas. But Ken, misunderstanding Carl, brings him to SCRTC's Christmas party. Eventually fed up with everyone, Carl exits SCRTC in a hurry after knocking down the Christmas tree with Miki the only one who knows the truth. Meanwhile, Mere is thinking of a Christmas present for Rio until Long arrives with one of Suugu's Twin Phantoms, Mythical-Beast Hanuman-Ken user Shuen, sent to cause mayhem across the city with his clones to gather screams from the populance. While Ken and Bion Biao attempt to understand Carl's issues in spite of the language barriers, the other Gekirangers battle the massive army of Shuens while the real one escapes to commit arson. While it all occurs, Ken learns from Carl's father, a North Korean diplomat, that the boy's hatred for Christmas stems losing his mother in a car accident, with Ken reasoning with Carl with his similar path before Shuen arrives. While Bion Biao protects Carl, Ken transforms into Geki Chopper and defeats Shuen with the Super SaiBlade, but Shuen enlarges and the Gekirangers bring out SaiDaiOh, Geki Fire, and Geki Tohja Wolf to battle with Bae commenting while Mere is wearing a special Santa outfit for Rio. Once Shuen is frozen, SaiDaiGeki Fire destroys Shuen. Later, the SCRTC gang resume their party at Carl's house, with SaiDaiOh creating an image of Carl's mother as Ken's present to the boy.