I had that issue too.
On my first playthrough I can talk to the Mayor (Cecil) about the Fabulous Five and finish the quest.
Now, on my second playthrough, Cecil don't have the Fabulous Five dialogue line. I think that's because this time I didn't speak to Arhu about his "failed experiment" and didn't get the Remote.
Try to talk to Cecil - if you have the Fabulous Five line, you can complete the quest. If you don't you are in the same boat as me.