Double Cross Ranch
From the Super Mario Wiki
The Double Cross Ranch is a ranch owned by Billy the Koopa, located in Sudden Death Valley. Not much is revealed about the Double Cross Ranch, except that is was used by Billy the Koopa as a hideout in The Super Mario Bros. Super Show! episode "The Provolone Ranger". On the ranch is a pen where Ostros were once kept, until they were freed by Mario. The symbol of the Double Cross Ranch is two Xs, which represent double crosses.
Billy the Koopa and a Koopa Troopa, having successfully hijacked Mario's stagecoach, along with Luigi, Princess Toadstool, Toad, and their trunk full of Gold Coins, abandoned Mario in the middle of Sudden Death Valley, and took off for the Double Cross Ranch, where they tied Luigi, Princess Toadstool and Toad each to a chair in the ranch's den.
Later on, a Koopa Troopa alerted Billy the Koopa that a masked plumber by the name of the Provolone Ranger was looking for him. Upon hearing this, Billy the Koopa rounded up the rest of his Koopa Troopas and set out to trap the Provolone Ranger. Although he failed to capture Mario, Billy the Koopa instead came back with Pronto, Mario's newfound ally, and tied him to chair next to Luigi, Princess Toadstool and Toad.
Mario eventually found his way to the Double Cross Ranch, and attacked the Pokey that was at the gate. Nothing more than a head, the Pokey bounced inside to alert Billy the Koopa of the Provolone Ranger's arrival. As Billy the Koopa ordered his Koopa Troopas to attack, Luigi, Princess Toadstool, Toad and Pronto managed to pull their chairs over to the window, so they could observe Mario's entrance.
A Koopa Troopa attempted to shoot Mario with a Cobrat from atop the balcony, but he missed, and instead Mario shot him with a miniature silver plunger, causing him to fall into the Ostros' water basin. Before more Koopa Troopas could attack Mario, he used his gun-slinging skills to open the Ostro pen, causing them to flee from the ranch, trampling all the Koopa Troopas in their path.
Billy the Koopa saw that his forces had been depleted and fled from the ranch on his own Ostro, bringing with him a pouch containing the Gold Coins he stole. Mario succeeded in stealing back the coins from Billy the Koopa, and returned to the Double Cross Ranch to free his friends.
What became of the Double Cross Ranch after these events remains unknown, as it was never seen again.