In Episode 2 "What If...T'Challa Became the Star-Lord?", set in Wakanda in 1988, the Ravagers instead of kidnapping Celestial Ego's son Peter Quill, mistakenly capture the Prince of Wakanda T'Challa.

@ Link to watch the movie is near the end of the article.

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This episode can be seen as Chadwick Boseman's last performance as the voice of T'Challa, before his death.

T'Challa's outstanding successes as Star Lord

It seems that T'Challa's achievements in the variant universe are more monumental than Peter's ones in the mainstream universe. T'Challa has helped Yondu and the Ravagers become more of the heroes, achieve more feats, and become more famous. He even successfully convinces Thanos to abandon the mad plan to wipe out half of the universe's population.

T'Challa also saved Drax's (Dave Bautista) home planet Kylos from a Kree invasion, so Drax's wife and daughter are still alive and Drax is working as a bartender. Drax is a huge fan of T'Challa and loves taking selfies with his great idol.

Since Thanos' intrigues in his quest for the Infinity Stones have shaped much of the MCU's mainstream timeline, this rewrites much of what we already know. However, there is still friction between Thanos and his adopted daughter Nebula (Karen Gillen) for some trivial reasons.

Taneleer Tivan – The Collector

It turns out that Taneleer Tivan (Benicio del Toro) has filled the power vacuum left by Thanos' reform. He even recruited the Black Order, the elves of Thanos as seen in the mainstream timeline, to be his sidekicks.

Tivan still enjoys collecting treasures, powerful weapons magical beasts from across the galaxy – including the Embers of Genesis, a nutrient-rich cosmic dust that can revive dead planets or nourish "billions of people across millions of worlds." This is the solution to the hunger of the galaxy, instead of going to kill half of the population as envisioned by Thanos.

In order to infiltrate Tivan's domain, Nebula stages the play of selling the Morag Orb to Tivan (used to contain the dangerous Power Stone).

Despite Tivan the Collector's use of some of the most powerful weapons in the universe, especially Hela's helmet, T'Challa and Yondu cleverly defeat him by trick and then imprison him.

The Fate of Peter Quill

Back on Earth, Peter Quill (Chris Pratt) of this reality seems to have grown up and lived a normal life, now working at a dairy store. Peter's father Celestial Ego (Kurt Russell) appears to meet him. As the Observer said, "Too bad this might spell the end of the world".

In the mainstream timeline, Ego the Living Planet - Star-Lord's biological father is a Celestial who controls humanoid avatar to travel through space. Over the years, Ego has planted seedlings on thousands of different planets to transform those planets into an extended life form of his own.

Ego needed the help of another Celestial to activate them, so he had sex with many women of various races on different planets in search of a child carrying the Celestial gene. And Peter Quill is that rare descendant.

In Guardians of the Galaxy Vol. 2, Peter Quill discovered Ego's plot and sabotaged it; but in this variant timeline, could a Peter serving at a dairy shop can do the same thing?