Yay! This definitely isn't a weekend plot, or even a week-long -- it's, like, a month, minimum, most of which is just the villains cackling and lurking while the watches have their effect.

It might also work to leave Luthor out, and have persistent, persuasive, perky salespeople in his place. I know the Smallville version best, but even that Luthor isn't so much with the perkitude.