Guardians Vol. 2: New Fan Theory Suggests Shocking Connection Between Peter Quill And Mantis
Why Not?

While Mantis was clearly scared of Ego the Living Planet, it was likely because she had knowledge of what he did to his other kids. With Peter Quill having arrived, anxious to get to know his own father, Mantis was the only person who knew what Quill was up to.
Ego may have simply kept Mantis for the purpose making him sleep and, possibly, using her powers on any of his kids who learn the truth and want to flee his planet.
The facts provided by Guardians of the Galaxy Vol. 2 are that Mantis was an orphan taken from her planet by Ego, a man who went from planet to planet impregnating aliens to try and create an offspring capable of carrying the Celestial gene. This is not too far off from Peter's story, as without his father and the death of his mother, he was an orphan on Earth.
Here's the thing: if Mantis is actually Peter Quill's sister, how will the world find out other than director James Gunn tweeting to confirm? This would mean their parents are gone and no one with knowledge of Ego's parenting them both remains to tell them the truth.
The next place we will see the Guardians is in their first crossover with the Avengers in Avengers: Infinity War. Avengers: Infinity War takes place four years after the events of Guardians of the Galaxy Vol. 2. Thanos and their crossover with the Avengers have likely provided much more to talk about than Ego the Living Planet by this point.
As the theory gains steam, Gunn may take to Twitter to deny it, so keep your eyes peeled.
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Guardians of the Galaxy Vol. 2 is written and directed by James Gunn (Slither). The film marks the return of the original Guardians, including Chris Pratt (Jurassic World) as Peter Quill/Star-Lord; Zoe Saldana (Star Trek Into Darkness) as Gamora; Dave Bautista (Spectre) as Drax; Vin Diesel (Furious 7) as the voice of Groot; Bradley Cooper (American Sniper) as the voice of Rocket; Michael Rooker (Jumper) as Yondu; Karen Gillan (The Big Short) as Nebula; and Sean Gunn (Gilmore Girls) as Kraglin. New cast members include Pom Klementieff (Oldboy), Elizabeth Debicki (The Great Gatsby, Everest), Chris Sullivan (The Knick, The Drop) and Kurt Russell (The Hateful Eight, The Thing).
Guardians of the Galaxy Vol. 2 is in theaters now. Spider-Man: Homecoming lands on July 7, 2017, followed by Thor: Ragnarok on November 3, 2017. After that Black Panther debuts on February 16, 2018, while Avengers: Infinity War hits theaters on May 4, 2018. Ant-Man and the Wasp is slated for July 6, 2018, followed by Captain Marvel on March 8, 2019.
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