Lisa's brother, medic doctor Joe, develops a potion to travel to alternate dimensions. They go looking for their sister Nina, whom they lost in their own dimension. However, they must be careful, as they are not allowed to change anything in alternate worlds. When Lisa risks everything to bring Nina to their world, everything threatens to collapse.

Collapsing

When a singing super heroine isolates herself from her surroundings by screaming because of her tragic past, she is forced to overcome her trauma to save the world from a meteorite impact.