The Gran Roca Ranch originally belonged to the family of the mother of the Tracy brothers; it now belongs to the five of them, together.
The ranch (also referenced as the Tracy Ranch) appears in Home on the Range.
Design[]
Upon first look, the Gran Roca appears as a rambling two-story ranch house; and as such, quite normal. However, just behind it, up on a hill, are big doors which allow the Thunderbirds craft to launch. It has been converted into a base for International Rescue to perform various tests.
Appearances[]
Home on the Range[]
The Gran Roca Ranch was attacked by the Mechanic in order for him to utilise the facility's impressive computing power, presumably in a move related to completing Project Sentinel. Along the way, the Mechanic also tampered with International Rescue's Z-band network, resulting in the Thunderbirds vehicles (including FAB 1 and MAX) going offline.