Professor Transo operated the Transo-Lation language school, which served as a front for his and Mumbles' criminal operation. They had several high-tech vehicles, including a hovering airship with an anti-gravity ray, and a submarine with a long-distance drill and vacuum tube.
When Dick Tracy sent Junior and Moon Maid to infiltrate Transo's school, Transo's receptionist sealed them in a glass bell jar. Transo and Mumbles then took them along on their attempt to rob a freighter carrying gold dust, believing that Tracy would not interfere and risk harming his family.
Transo was eventually captured along with Mumbles.
- With his dark hair and moustache, Transo slightly resembled Sketch Paree.
- It is unknown if Transo was an actual professor, or even if "Transo" was his real name.
- Unnamed Receptionist
- Unnamed Henchman