Thomas the Tank Engine & Friends Season 20 Episode 11 Letters to Santa Episode Title:Letters to Santa.Episode Description:Percy still remembers the time he raced against Harold the Helicopter. One day, he is bringing letters to Santa, and thinks that Harold is calling him slow and out of date again, and decides to not listen while he tries to make up for lost time due to the snow. Not realising that Harold is trying to warn him, Percy ends up in a blocked tunnel of snow. Harold offers to take the mail to Hiro, which Percy accepts. Thinking Harold is bothering him, Hiro says that Percy never arrived. Harold explains, as Hiro comes to a stop. The following day, Percy looks after Harold, and finds him on the other side of the Vicarstown Bridge. Harold says he has run out of fuel, and Percy gets some fuel for him, saying that friends are to help each other, and it will soon be Christmas.