Reinforcements from the Future was the first American made crossover, as there was no Gaoranger vs Timeranger. And was the last crossover until Thunder Storm 2 years later. And it's still one

A minor Easter egg: the opening of the new trailer mirrors the first panels from Doctor Strange's first comics appearance. : r/marvelstudios

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Sentai Rambling: Beyond All Space And Timeranger, Beyond All Space And Time Force!

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Has Power Rangers gotten better or worse over the years? - Quora

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Ranger Ranker! #11 – Power Rangers Wild Force – The Avocado

The best Ranger teamup IMO, Reinforcements From The Future. Happy Power Rangers Day! : r/powerrangers

Tommy Oliver, RangerWiki