- Ben 10: "what if... the 2nd Body Switch spell attempt went wrong" (Episode A Change of Face)

-.

-old version:

When the spell is cast the Omnitrix energies cause the spell to go wrong, Gwen is placed back into her body, but Charmcaster and Ben instead of swapping bodies get fused together into a new person, which results in their minds/memories combining, this allows the new person, named Hope Tennyson, to know all about Charmcaster's past, losing her father and home, needing to survive and trying to gain the power to take down Addwaitya.

After telling Gwen and Max they decide to help, Hope helps train Gwen in magic while also learning their own new powers of both alien and magic capabilities, years later with their friends, allies, including Hex and a few other former villains, and years of experience they enter Legerdomain, fighting against Addwaitya to reclaim The Realm of Magic.

-.

-new version:

As the spell was cast and covered Ben, Gwen, and Charmcaster the magic energies reacted with the Omnitrix's own energy causing them both to become unstable and burst out of the watch, resulting in a small explosion of pink and green energy that blew Max onto his backside. A few minutes passed after the blast before Max got back up, he looked around for his grandkids, the smoke and dust making it hard to do so but he soon found Gwen who was sitting up and rubbing her head, he asked if she was herself again and she confirmed it when asked a question about her 8th birthday, the pair's attention was grabbed by the shadow of a rising figure nearby, they called out asking if it was Ben, the person said "yes.. no... I am but... I'm not? i... I don't know..." the figure walked out of the smoke and the pair were shocked at what they saw.

The figure had Charmcaster's body build but was slightly shorted, their hair flowed from a brown base to a silver-white mid-length down to the ends, their eye colour was a pink outer rim with green inner ring, two gold earrings on each ear along with purple lipstick, their clothes was a white tight shirt with swirling purple lines flowing up around the collar to the sleeves, an open magenta coat with black lines at the sleeve ends that flowed along the back of the arms to the collar and outer edges, purple form-fitting cargo pants with side pockets that smoothly transitioned into short heeled boots with black and white straps around them, a black belt with purple rounded buckle, a magical bag around their waist and on their left wrist was what looked like the Omnitrix only it was now smoother, almost like an armband, it's main colour was still black but now it had purple instead of green and had runic markings along its ends.

Gwen was shocked but seeing the watch she asked if it was Ben, the woman said she was but wasn't, that she was Ben and Charmcaster together, she had all their memories, she proved this by mentioning a few things from before their summer trip, but she was so confused on who she was, was she either Ben or Charmcaster or neither, Max calmly placed a hand on her shoulder and stated why can't she be both, this had her smile but then tears started to fall, when asked what was wrong she said she knew why Charmcaster was trying to get power, it was to face a foe called Addwaitya.

The family sat down with some hot chocolate as the girl explained, she told them of where Charmcaster and Hex came from, another dimension, that their home was one of magic and crazy physics, that it was conquered by a giant turtle creature that got its hands on a powerful ruin stone and forced Charmcaster and her uncle to run from their home while her father gave his life for them to live, that all she wants was for Addwaitya to be defeated and maybe bring her father back, but she didn't believe in it as she knew the girl's father wouldn't want the price to be paid for his return, when asked what the price was she said it was 600,000 souls which shocked them both for a few moments before continuing on.

After a bit more talking the girl, now named Hope Benjamin Tennyson, stated she wanted to at least help free Charmcaster's original home in her memory as she was a part of her, the others agreed and began making plans, they knew they couldn't do it right away, both because of Hope's new form and abilities needing to be trained, and for them to gather the tools and help to accomplish it, with their plans laid out they continued their summer vacation.

Time passed, Gwen was taught by Hope as they both learned and relearned magic together, the three of them having to tell the family about their adventures and what happened to Ben and her new form, along with Max's life as a plumber which resulted in both Gwen and Hope being told of their grandmother being alien and her powers being the main source of magic known as Mana, over time Hope took off the watch from a decline in bad guys but still kept making plans for their reclaiming of Legerdomain, she put it back on when the events of Alien Force happened and teaming up with Kevin, who was shocked over Ben's fusion with Charmcaster becoming Hope, after the events of Ultimate alien and with her new modified Magic infused Omnitrix the team and all their allies, including a calmed with aged Hex, and Plumbers made their move on Legerdomain, they battled Addwaitya and his army, using her magic and powered up alien transformations they were able to beat him and drain him of all his magical abilities.

With her old home now free and being claimed its mistress by magic itself, Hope had Hex placed as her regent to help rebuild the lands to what they once were for all, this was so she could continue keeping the galaxy safe on earth, with that done and new alliances forged Hope continued on her grand adventures into the Omniverse.