Ryan Choi, also known as the second Atom, was a member of Team Nucleus.
After ingesting milk specifically made for The Atom's baby son Smidgen, members of the Tiny Titans were accidentally shrunk. Dot called her father for help and after explaining the situation to his team, Ant suggested they call his uncle, Uncle Ant, who had the ability to change the size of others. They rushed over to Titans Treehouse and Uncle Ant, after multiple tries, was able to get the Titans back to their normal sizes.
- 2 Appearances of Ryan Choi (Tiny Titans)
- 2 Images featuring Ryan Choi (Tiny Titans)
- Quotations by or about Ryan Choi (Tiny Titans)
- Character Gallery: Ryan Choi (Tiny Titans)