Disillusioned with social media’s influence, Lightning Girl retires, but she’s forced into one final battle, without superhero powers, when her nemesis, her brother, cuts off Seattle’s water supply.

Another kick at the can.

When her old nemesis resurfaces and cuts off Seattle’s water supply, a disillusioned Lightning Girl, who’s renounced her superpowers, faces a final battle with her vengeful, reanimated brother.

Thank you. Food for thought.

Is it comedy? It seems where a plot is being forced to a very passive character... (Hancock) and thats one way to do a comedy.

I see the wordplay "disillusioned" and a plot where she will illuminate again on bonding with brother... but again "estranged" leads to a plot to discover a character who eventually will be her nemesis. But I am more interested in watersupply problem being a forced plot for comedy... How? Unclear from a logline.

"A dejected superhero with electrical powers is buzzed to face his/her estranged non-superhero brother when he threatens to harm the source of supply of his/her powers."

A sibling quarrel throughout 😂😂! More of a home video than a film though. I would watch it.

A variation on your suggestion:

A disillusioned superhero calls it quits, but faces a final battle–without her super powers–when her nemesis, her estranged brother, holds the citizens of Seattle hostage when he turns off their water supply.

When her brother cuts off the water supply to Seattle, a disillusioned superhero must (Do this thing) in order to (Prevent this bad thing from happening)