A Pig Called Pete... Meets a Sheep Called Sean — Alan Bowater

Sean the Singing Sheep introduces Pete to a whole new worldouter space. Sean is a baritone with a penchant for building things with boxes. The two adventures build a spaceship and travel past the planets, learning a bit about each. While on Pluto, they play games together, but it doesnt end well. Pete learns that sometimes friends say hurtful things that they dont mean, and they should be forgiven.