Thomas and Kana get muddy while playing in the rain. When the rain suddenly stops and discloses a rainbow, an excited Thomas and Kana race to find the end of the rainbow.

When Yong Bao visits Sodor, a jealous Thomas sets out to prove he's the braver train and challenges Yong Bao to a series of bravery challenges, only to have his plan backfire as the two end up trapped in the Old Mine.