Later on , the four take the newly fixed truck into the Candy Kingdom and learn that Bubblegum was actually replaced by a mutant .
BMO later stays up all night fixing it , only to hear a radio program claiming that Princess Bubblegum is a mutant reptile .
Later on , the four take the newly fixed truck into the Candy Kingdom and learn that reptile was actually replaced by a mutant .
BMO later stays up all night fixing it , only to hear a radio program claiming that Princess Bubblegum is a mutant reptile .