Super Hero Taisen GP: Kamen Rider Sangou

Toei Crossover Movie
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Theatrical release March 21, 2015 (2015-03-21)

Kamen Rider Sangou

Spider type

シュリケンジントライドロン

Combine with ShurikenJin and Tridoron (with Tridoron Shuriken).

Finisher: ShurikenJin Tridoron Finish

The release date is like a countdown: 3-2-1.
While it's called a Super Hero Taisen movie, the only non-Rider heroes to appear are the Ninningers. This really should have been called a Kamen Rider Taisen instead.
It opens on February 10, 1973 (1973-02-10), which was the day the finale of the original Kamen Rider series aired.
Near the start of the alternate timeline, there's a Shocker GP to select new Shocker Jugend. This is a reference to Hitler-Jugend which means "Hitler Youth".
When Sangou saves Go and Yuuto from Garren, he bursts through the wall. In the first episode of Blade, Blade bursts through a wall to save Garren at the very beginning.
Zeronos says "let's meet someday in the future", which is a phrase his character utters in Den-O.
When Sangou is around, black feathers appear, foreshadowing his betrayal. When he turns good, the feathers are white.
- Kuroi's name means "black" in Japanese.
- Before the reveal, when Yuuto arrives in Rider Town, the sound of ravens can be heard.
When Minami Koutarou appears, he wears the same color scheme as when he appears on Decade. When he's Black, he wears fingerless gloves and a black outfit. When he comes back as Black RX, he wears a white outfit with a white jacket with black pockets.