Dinosaur King
Dinosaur King

Dino Slash! Carnotaurus, blow them away!

—Rex Owen, Summoning Speech

Rex Owen (originally Rex Ancient) (レックス・オーエン Rekkusu Ōen) is Max Taylor's best friend, who also lives in Max's house. He owns Ace the Carnotaurus. He is voiced by Matsuri Mizuguchi in the Japanese version and Sebastian Arcelus in the English dub. Like the series' title, Rex's name literally means "King".

Character Design[]

Rex has pale skin, blonde hair which notably sports three ahoge hair strands from behind his head (two in the anime) and blue eyes. He wears a multi-blue, long-sleeved jacket over a white T-shirt with brown pants. He also wears blue sneakers and owns a dinosaur tooth necklace, similar to that of the other members, except his is larger than Zoe's and Max's.


Rex uniquely keeps the same name in both Japanese and English, it likely being in basic reference to dinosaur topics. "Rex", meaning "king", is likely derived from the well known "Tyrannosaurus rex" species name, while "Owen" is likely taken from Richard Owen, the scientist who first proposed the group of prehistoric animals called "Dinosauria" in the 1800s.

His real last name in English, "Ancient", is simply a reference to the ancient age of dinosaurs.


Rex is the quiet one and is the good-hearted member of the group, with a mysterious past that he occasionally thinks about, he is also very smart for his age. He was adopted by paleontologist Dr. Owen, Dr. Taylor's friend. He had been born in the Mesozoic Era to Dr. Ancient and Dr. Cretacia during their expedition on the Backlander. He has a crush on Zoe Drake [2]. He has fought with Max on several occasions, much to Zoe's frustration. Rex's personality is shown to be quite cautious and serious, it comes with this personality that usually conflicts with Max's personality in most cases, and has sometimes gotten him into terrible situations along their adventures. He is also shown to be quite exaggerative and harsh amongst the other characters over the destruction of his things (e.g. a trilobite fossil and a dinosaur book), which in turn usually ends to the point where Rex refuses to talk anyone (namely Max). But when seeing the errors of his ways or if his comrades are in danger Rex eventually puts differences aside to help aid his friends. In general, Rex is quiet, smart, determined, irritable, cautious, good-hearted and dinosaur-loving.

In the Taiwanese game, it notes that Rex works well with Max. He analyzes fossils found by Max, and that he is better with dinosaurs than Max.


  • "Carnotaurus, blow them away!" (English Summoning Speech)
  • "Blast through! Carnotaurus!" (Japanese Summoning Speech)


Main article: Ace

Rex's dinosaur is Ace the Carnotaurus, a Wind attributed dinosaur. Ace is the fastest member of the team, as well as the only carnivorous dinosaur. Ace, in his chibi form, is very playful and occasionally gets on Rex's nerves, but Rex can't imagine life without his little buddy. In full form, Ace is a powerful dinosaur to fight against, and his agility can dodge fast Moves that come his way (such as Tail Smash and Shockwave).




Rex was the only child born to Dr. Ancient and Dr. Cretacia. After Rex was born, his parents began to fight with Dr. Z, who made dinosaurs fight for his amusement and didn't want to return to the year 2126, the time they were from. Later, Dr. Z teamed up with Seth to get rid of them. When they put their plan into motion, baby Rex was sent to the present, while his parents were sent flying somewhere. He was found in the Smithsonian Museum by a bachelor named Dr. Owen, who adopted him. Since he was a traveling paleontologist, it interfered with taking care of Rex. Thus, he sent him to his close friend, Spike Taylor.

Dinosaur King[]

Many years later, when he and the D-Team are twelve years old (or thirteen in that area...), Max sees a meteor falling from the sky, and wakes up Rex. The next morning, he, Max, and Zoe travel to the forest, where they find three stones with Wind, Lightning and Grass on them. Rex picks up the Wind stone. Then, Max finds two cards: a Triceratops and another odd card. He rubs the Triceratops on his Lightning stone, where it comes to life! However, Max soon discovers how to transform it back to a card and eventually, how to create a miniature, chibi version of the Triceratops (who Max names Chomp).

Later, D-Team had to face the Alpha Gang, who summoned Terry the Tyrannosaurus. Rex notes that it would be impossible for a Triceratops to defeat a Tyrannosaurus, however, Max and Chomp defeat it with the move card which Max found: Electric Charge.

Later, Dr. Owen finds two more cards, a Carnotaurus (with the attribute of Wind) and a Parasaurolophus (with the attribute of Grass), named Ace and Paris by Rex and Zoe respectively. D-Team gets along well with their dinosaurs, often keeping them in their chibi forms (In the chibi form, Max's mom thinks of Chomp, Ace, and Paris as "weird-looking dogs"). They constantly fought the Alpha Gang who wanted all the dinosaur cards and move cards, with Rex and Ace often fighting Tank the Saichania.

Later, Rex and D-Team were told the truth of Rex's parents through Jonathan: Rex was born to Dr. Ancient and Dr. Cretacia during a time travel mission to the Mesozoic Era from the year 2126 A.D.

Mesozoic Meltdown[]

Rex met his parents, who came back. Rex's parents take the dinosaur cards and the element stones from D-Team and Alpha Gang. Rex, his parents, Jonathan, and Alpha Gang fly back to future through Backlander. However, due to Spectral Space Pirates' attack, they had to come back. Gabbro later kidnaps the D-Team's parents.

They fly from one time period to another, led by Pterosaur. They eventually begin to find Cosmos Stones. After the defeat of Spectral Pirates and Seth, Rex, his parents, Jonathan, and Alpha Gang fly to the future. Because the Backlander was damaged, they used the spaceship of the Spectral Pirates, which could take only one flight (it also meant that Rex could not come back from the future to meet Max and Zoe ever again).


In the manga, Rex is an American transfer student. He at first didn't speak Japanese and could only speak English, so no one understood him. Although one day he was reading a book and Max jumped out and scared him, and then notices Rex was reading a book on dinosaurs. Max says he loves dinosaurs too, and he wants to be a paleontologist when he grows up. Max then remembered Rex didn't speak Japanese, so he showed with gestures and hand signals that he loves dinosaurs. Soon he and Rex become best friends.

They one time find a fossil together, but it breaks, so they share the two pieces; Max puts the small bit on his waist pack, while Rex wears the bigger piece around his neck. Rex also is very smart and is seen often blowing pink bubblegum and a lot of the girls in his class like him. Rex has also mentioned having parents and also mentions to Max that he owes him a certain number of puddings for doing something dangerous or something he doesn't want to do with him.

His dinosaur is Benjamin, a carnivorous dinosaur that was found by Max at Alpha Mountain.

DS Game[]

Near the start of the game, the player can choose to play as either Max Taylor or Rex Owen; if they choose Rex, they will start out with a Carnotaurus. No other major story differences seem to exist based on this choice.


TCG Stats[]

Rex owen TCG Card

Rex Owen TCG card (DKCG)

  • Team: D-Team
  • Card Codes: DKSS-031/030, DKCG-144/160, DKTB-076/100, DKAA-070/100, DKBD-072/100, DKDS-071/100, DKTA-071/100
  • Card Rarities: Oversized Exclusive (DKSS), Silver Rare (DKCG), Common (DKTB-DKBD, DKTA), Gold Rare (DKDS)
  • Image From (DKSS/DKCG): Ep. 32 anime scene
  • Image From (DKTB): Ep. 27 anime scene
  • Image From (DKAA): Ep. 9 anime scene
  • Image From (DKBD): Ep. 49 anime scene
  • Image From (DKDS): Ep. 57 anime scene
  • Image From (DKTA): Ep. 61 anime scene
  • Abilities:
(DKSS/DKCG) Your opponent discards 1 card. Then, search your deck for a Move and put it into your hand. (Shuffle your deck after you search it.)
(DKTB) You can choose 1 of your opponent's level 5 or lower Dinosaurs. Return it to your opponent's hand. Search your deck for a Move or an "Ace" and put it into your hand. (Shuffle your deck after you search it.) You can include "Ace" in your deck only if you are using this Character.
(DKAA) Choose 1 of your Wind Dinosaurs. It gains +700 Power the next time it battles this turn. Then, search your deck for an "Ace" and put it into your hand. (Shuffle your deck after you search it.) You can include "Ace" in your deck only if you are using this Character.
(DKBD) The next time one of your Dinosaurs battles this turn, any Moves it uses are put back into your hand instead of going to your discard pile. Search your deck for a Wind Super Move and put it into your hand. (Shuffle your deck after you search it.) You can include "Ace" in your deck only if you are using this Character.
(DKDS) If you have 3 or more cards in your hand, discard 3 random cards, then draw 5 cards. You can include "Ace" in your deck only if you are using this Character.
(DKTA) Search your deck for an "Ace (Battle Mode)," an "Ace (Dinotector)," or both and put them into your hand. (Shuffle your deck after you search it.) You can include "Ace" in your deck only if you are using this Character.


  • Rex is the first member of the D-Team to lose a battle, specifically against Terry (not counting Chomp collapsing of exhaustion after winning his first battle).
  • Rex is the only character with a given birthday, which is on June 10. His 12th (adoptive) birthday was on Sunday June 10, 2007, the day its respective episode first aired in Japan.
  • In Kyoryu-King.com's 4komas, Rex is occasionally shown with a form of anthropomorphism as a half human, half Carnotaurus person. In this state, he can use Wind Moves (e.g. comics 29 and 87).
  • This character is very ironic, as his name is Rex, but his dinosaur is a Carnotaurus instead of a Tyrannosaurus rex.
  • He is one of the few characters to keep their original name in the dub, as his name is already English. Ace also kept his original name in the dub. Other characters are Spartacus, and Aki Taylor (Max's mother) kept her first name the same, although her last name changed.
  • Although his real name is Rex Ancient, the Japanese website keeps his name as Rex Owen, which may mean that Rex chose not to adopt his real family name, or that the website simply didn't get updated.
  • Like Max, Rex is hinted to have had a crush on Zoe. Also, like Max, he later developed one on Zahrah during their mission to find the Red Cosmos Stone. He explains to Max that she makes his insides tangled up, and becomes very jealous when she is with Aladdin when he promises to protect her.
  • Rex wearing vest with no shirt in DVD cover.
  • He was born in the Mesozoic Era, but due to time travel, he never lived through the intervening years, and so this fact does not affect his age.



Concept art[]


Box Cover[]




p · e · t Main Characters
D-Team: Max Taylor · Rex Owen · Zoe Drake · Spike Taylor · Reese Drake
Alpha Gang: Dr. Z · Ursula · Zander · Ed · Rod · Laura · Seth (former) · Helga
Spectral Space Pirates: Spectre · Gabbro · Foolscap · Shear · Seth (former) · Goma