Spy Kids 2: The Island of Lost Dreams
The treehouse was first seen in Spy Kids 2 when Carmen and Juni enter, then Carmen used the computer chairs inside to hack into the OSS and reinstates Juni. They then used R.A.L.P.H. to spy on Gary and Gerti Giggles. Finally they used the computer to assign themselves the Giggles' assignment and giving their rivals a fake one in Africa. Immediately after finishing this, Machete enters and shows them his newest gadgets.
Spy Kids 3: Game Over
In Spy Kids 3, the treehouse was used as Juni's detective agency office after Juni quit, thinking that he'd rather be himself than an agent. He briefly received a visit from former rival Gerti consoling him to return to the OSS and reminding him that everybody is his family before she left. Later Juni is contacted by Devlin and told Carmen is missing.
Spy Kids Adventures
A New Kind of Super Spy
The treehouse uses Carmen and Juni's full names and a code to enter and has a single helicopter pad. Inside, there are tables full of tools and two computer chairs rise out of the floor. In Spy Kids 2, there are a row of Juni's drawings hanging on the wall.