In the Daring Do book series, Dr. Caballeron made his debut in book 4, Daring Do and the Razor of Dreams. He is stated to have wanted to partner up with Daring Do on her adventures, but Daring Do refused.
Caballeron is working with Ahuizotl. He wanted to sell the Ring of Destiny to the creature, make a fortune and retire in splendor. What Ahuizotl intends to do with the ring is apparently of little consequence to him. Caballeron and three stallions take the ring by force from Daring Do. Actually Caballeron doesn't care about who wants the ring as long as he/she pays for it.
In fact in the forest, Dr. Caballeron and his henchponies encounter a disguised Daring Do who offers a large bag of bits for the ring and they have a deal. When Ahuizotl angrily storms onto the scene, Caballeron makes off with the bits and leaves the ring behind.
Dr. Caballeron appears again in Stranger Than Fan Fiction. He seeks an amulet in Daring Do's possession that is the key to the seven-sided chest, a treasure that he seeks to sell to the highest bidder. He captures Rainbow Dash and Quibble Pants, believing them to be working with Daring Do and intending to lure her to the jungle so she'll trade the amulet for them. When they escape, they unwittingly lead him to the temple.
When a monster called a Cipactli attacks, Caballeron and his henchponies escape through a door, which closes, but with Daring Do's help, Rainbow Dash and Quibble Pants escape with the treasure. Caballeron and two of his henchponies, Rogue and Withers, search for them, but Daring Do throws a rock at the temple wall to release the Cipactli, which chases after Caballeron, Rogue, and Withers. Their fate beyond this is unclear.
- Dr. Caballeron's appearance and approach to archaeology mirror those of Indiana Jones character René Emile Belloq, who also sold artifacts for personal profit.