Thomas, You're the Leader, sometimes called Roll Call Rap, is a hip-hop/pop-rock styled song that plays during the end credits of the 2008 film, The Great Discovery right after the Engine Roll Call. The song is based on the Engine Roll Call, but with additional verses about the Skarloey Railway engines, the Pack and the remainder of the vehicles. A second altered music video was later made using footage from the thirteenth series, but in that version, Stanley, the Skarloey Railway engines, the P