Zookeeper as depicted in Teen Titans vol. 3 #14 (October 2004). Art by Tom Grummett, Lary Stucker and Jeromy Cox.
Publication information
PublisherDC Comics
First appearanceTeen Titans vol. 3, #13 (September 2004)
Created byGeoff Johns
Tom Grummett
In-story information
Alter egoSamuel Register
Team affiliationsSecret Society of Super Villains
Notable aliasesDr. Register
AbilitiesMetamorphic ability to transform into any animal.

Zookeeper, a.k.a. Dr. Samuel Register, is a fictional character from the Teen Titans comics.

Publication history

Zookeeper first appeared in Teen Titans #13-15 (Sep. - Nov. 2004) and was created by Geoff Johns and Tom Grummett.

Fictional character biography

Dr. Samuel Register worked with Mark and Marie Logan in Africa. He despised their rambunctious son Garfield, who constantly caused damage in his lab. He was (and still is) obsessed with people calling him "Dr. Register" and nothing else.[1]

After Logan's parents successfully cured Garfield of Sakutia, Register went on to try to finish their work. He became mad for results and inhumanly slaughtered animals in experiments that produced grotesque mutations. This earned him the nickname "Zookeeper".[2]

In the "Beast Boys and Girls" storyline, Register stole a sample of Sakutia to try to mutate it like Garfield's parents did. He accidentally infected himself and every kid in San Francisco, and the infection turned his skin purple. When Beast Boy was infected, the virus in him was canceled out and he was cured.[2]

Zookeeper injected venom from the Australian funnel-web spider into Garfield and attempted to dissect and extract the cure to Sakutia from him. Cyborg and the other Titans kept Register busy while Raven healed Beast Boy. Wanting to stop Zookeeper desperately, Garfield reinfected himself with Sakutia. His powers back to speed, Beast Boy fought and defeated Zookeeper in a shapeshifting battle, afterwards discovering how to cure the kids that were infected children.[3]

During the Villains United Infinite Crisis Special, Mammoth broke Zookeeper out of prison. He then joined Alexander Luthor, Jr.'s Secret Society of Super Villains.[4]

Some time later, Zookeeper was recruited by Superboy-Prime as part of a new version of the Legion of Doom.[5]

Powers and abilities

Zookeeper can turn into any animal at will, just like Beast Boy. However, his side effects are different from Garfield's. His skin is purple and scaly and his eyes and hair did not change color with his skin.


  1. ^ Teen Titans vol. 3 #14 (October 2004)
  2. ^ a b Teen Titans vol. 3 #13 (September 2004)
  3. ^ Teen Titans vol. 3 #15 (November 2004)
  4. ^ Villains United: Infinite Crisis Special
  5. ^ Teen Titans vol. 3 #98