Heart is a tyrannosaurus who is found and raised bv a herbivore mother. After learning his true nature as a meat eater, he runs away from home and finds a baby ankylosaurus egg that hatches and thinks Heart is his father. After accidentally naming the baby Yummie - thinking he looked tasty - their love for one another tests the bounds of nature vs. nurture.
| Actor | Role |
|---|---|
 Kappei YamaguchiHeart (voice) | Heart (voice) |
 Seishirou KatouUmasou (voice) | Umasou (voice) |
 Tomoyo HaradaMother (voice) | Mother (voice) |
 Tokuyoshi KawashimaLight (voice) | Light (voice) |
 Tetsuya BesshoOne-eyed Bacu (voice) | One-eyed Bacu (voice) |
 Rikako AikawaHeart (young) (voice) | Heart (young) (voice) |
 Takuya KirimotoGonza (voice) | Gonza (voice) |
 Maria KawamuraLicker (voice) | Licker (voice) |