Doctor Dome's fortress is a location appearing in the 2003 TV series episode "Return of the Justice Force". The building, which is shaped like a giant, blue dome, is located in a heavily wooded area of Northampton Massachusetts. A set of stairs leads up to the round shaped entrance, but the majority of the structure is located underground in a cavernous space.
During a fight against Domeoids at the home of Stainless Steel Steve, two members of the Justice Force were captured. Due to a tracking device placed on them by Donatello, the Turtles, Casey Jones and Steve were able to follow them to the fortress built and owned by Doctor Dome. Finding it heavily guarded by Domeoids, the Turtles trick and capture some of the little robots. Using the robot's domes mounted on their own heads, the group was able to sneak into the fortress.