Which gaming mascot made history by appearing in a rival company's game for the first time when Banjo & Kazooie were added as DLC fighters in Super Smash Bros. Ultimate?

In the world of gaming, strategic brand partnerships have created some of the most iconic collaborations, expanding gaming universes and bringing beloved characters into new digital realms. This question tests your knowledge about a groundbreaking partnership that changed how we think about brand crossovers in virtual worlds. Do you know your gaming industry business moves well enough to identify this landmark collaboration?

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Banjo & Kazooie (Rare/Microsoft) appearing in Nintendo's game
Crash Bandicoot (Sony) appearing in Microsoft's game
Sonic the Hedgehog (Sega) appearing in Nintendo's game
Master Chief (Microsoft) appearing in Sony's game