Meg is injured by the power of the tesseract and is healed by beasts from a planet called "Ixchel". The 3 W's suddenly return and they all try to come up with a way to save Charles wallace as Meg suddenly realizes that she's the only one who can save him.
Meg has to face "Charles Wallace" and get him back to normal. Meg figures out that she does have one thing that IT doesn't have..which is love. She loves Charles Wallace and wants him back. She calls his name with her gift of love. This action destroys IT with the black darkness and they tesseract home.
Meg learned that the power of love really does work and she loves her family a lot. She also brought her dad back to Earth.