So the ToQgers arrived in Zawame City, and were quickly told that there were no Shadows there. So they thought they could take it easy, when monsters not of Shadow or Inves origin suddenly appeared. And when they transformed, they encountered this guy.

Later, when Right wanted to take Kota on the train, he realized Kota couldn't get on without a Pass. However, they encountered this guy.

Meet Narutaki, a character from Kamen Rider Decade. He introduced himself as an ally of all Kamen Riders, and gave Kota a Rainbow Pass. However, anyone who is familiar with Decade knows that he was one of the antagonists, and always blamed everything on Decade.

Later, after an Inves that showed up through a crack ate some Lockseed fruits and grew to giant size as a result, which caused the ToQgers to form ToQ-Oh in response, we had a funny moment when Tatatora Kureshima, also known as Kamen Rider Zangetsu-Shin, dismissed the reports of a giant robot fighting a monster as a sign of insanity from his people, even though the battle was happening right outside his window!

Afterwards, Kota asked Right for a favor. He wanted his friend Mai to be somewhere safe, because he knew the situation in Zawame was bound to escalate. So they gave Kota's Pass to Mai, and had her get on the train just before it was about to leave. It didn't quite work out, because as soon as Right had told the others to keep the truth of this a secret from Mai, Wagon blabbed about it to Mai.

Mai then got off at Eastern Zawame, and was promptly captured by the mole kaijin and Badan Empire foot soldiers who had originally let these two groups of heroes meet up.

There were some complications, such as the mole kaijin finally summoning a fellow mole kaijin instead of opening another crack, but they got Mai to safety. However, a complication appeared to give the ToQgers some extra trouble in the form of Kamen Rider Fifteen.

Ominous Rider is ominous. However, Kamen Riders 1, 2, and V3 showed up to keep him busy, allowing the ToQgers to take out the mole kaijin...with a Whack-A-Mole Rainbow Rush! However, after the first three Riders, who had declared themselves to be the Showa Riders, had managed to repel Fifteen, when they were asked if they were going to help Kota, they said that they would not work with the Heisei Riders.

Afterwards, the ToQgers and Kota said farewell for the time being. They'll meet again in Heisei Rider Vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai.

3163501 Riders actually are not teams at all. It usually starts with one character as the Main Rider, with some Secondary Riders joining in and helping out around episode 16.

The only American equivalents we have are Saban's Masked Rider, a Kamen Rider Black RX adaptation that you're honestly better off not watching at all, and Kamen Rider Dragon Knight, the adaptation of Kamen Rider Ryuki.