The Lair  is the home and base of operations for the Teenage Mutant Ninja Turtles in the Turtles' dimension.
Donatello, Leonardo, Michelangelo, Raphael, Casey Jones, and April O'Neil tested the Interspatial Teleportation Unit in Harold's Laboratory by setting the coordinates to the Lair. Due to Harold Lillja's attempt to kill an annoying fly, a switch was accidentally hit. The Turtles, April, and Casey appeared in the Lair briefly. By the time Splinter turned around, they were gone and he assumed the television was left on again. The Turtles, Casey, and April were teleported back to their home dimension and arrived in the Lair. Splinter mistook their return as them finally mastering their stealth skills.
- ↑ Donatello (2014). IDW Comics- "Teenage Mutant Ninja Turtles/Ghostbusters Issue #1" (2014) (Comic p.8). Donatello says: "I figure just a quick trip to the lair and to surprise Master Splinter..."