Don't Judge a Book by Its Cover, retitled You Can't Judge a Book by Its Cover on CD releases, is a song from the fourth series which is based on Terence's theme and is dedicated to how Thomas first meets Terence. It aired in the US on the Shining Time Station spin-off Mr. Conductor's Thomas Tales episode, For the Birds. The song had two versions for two airings of Storytime with Thomas in 1999.