Just finished binge watching the first season of this series. The premise is an arrogant, mad scientist experimented on young children using genetically modified stem cells. The first episode starts with the kids running out of their medications and having their powers kick in. There's only 3 or 4 transformations taking place in the first series. A teenage boy becomes a chupacabra, a girl transforms into a purely electric being, a female doctor becomes a Jekyll and Hyde character and a teenaged girl becomes a mouse girl.
https://www.youtube.com/watch?v=-ZwCiqEAH3g
https://www.youtube.com/watch?v=h_27GgrNWOg&t=135s