Alternate

Alternate is a franchise that takes place on an alternate half earth (the other half being the Otherworld) The franchise is one of the more darker franchises out there. The main character, Sophie, is a human, while the Other inside her is Sophia. Their combined name is Soph.

Basic Plot
Sophie witnesses her mother die in a car crash. Sophie, an Other, greets her to help take the pain away. It works, but then it only gets worse. Sophie spends two years in rehabilitation, then decides to pay for college. She meets her roommates, Sam (a Universe Jumper) and Harvard, a Catatian. She also meets Danny, a nerdy human.

Then, after Sophia attacks a restaurant, Danny directs Sophie to Thomas, who said his dad was murdered two years ago and was greeted by an Other, Tommy. Sophia then explains that Tommy needs to be killed, while Tommy tells Thomas the same thing about Sophia. So, the two engage in a fight. Tommy wins easily.

Sophie spends a couple hours in a hospital recovering, when she wakes up and escape, covered in blood and scars and runs away, causing a big crowd. When she sees Thomas in the street, Sophia comes out and attacks Thomas. Then, Sophia retreats, and Sophie kills Thomas.

Sophie is sent to prison and then is greeted by Sophia who tells her that she snuck aboard The Otherworld Mothership and quietly got onto Sophie's earth. She came to stop all The Others but couldn't find any. Sophie has a change of heart and combines with Sophia to become Soph. Soph then sneaks aboard the Mothership to confront The Other. After talking to The Other, she points a gun at her head and pulls the trigger.

However, in a shocking turn of events, Soph turns the gun to point at The Other, and is able to almost save the day. Sophie and Sophia talk and decide to become Soph for forever.