|This article is about a/an villain base in Kamen Rider BLACK RX.|
Crisis Fortress (クライス要塞 Kuraisu Yōsai?) was the base of the Crisis Empire in their invasion of Earth. An altered version of the ship, called Super Crisis Fortress (スーパークライス要塞 Sūpā Kuraisu Yōsai?) was used by the Dai-Shocker remnants who called themselves Super Shocker. Later, during the events of Super Hero Taisen, another rebuilt Crisis Fortress served as the base of a revived Dai-Shocker.
The Big Machine is the combined mecha formed out of the Crisis Fortress and the Dai-Zangyack base, the Gigant Horse. It was made when the members of Dai-Shocker and Dai-Zangyack secretly united behind Tsukasa Kadoya and Captain Marvelous. It was destroyed by Rocket Drill Go-BusterOh.