Invader Franny was an Invader Zim / Franny K. Stein crossover fan fiction posted on fanfiction.net by B gal on December 19th, 2006.
The story has Franny K. Stein becoming a new student at the Skool and befriending Dib. One day, they decide to use time travel to see if Zim will be a major threat in the future, but find themselves in a Bad Future where Dib has become evil and renamed himself Dark. With the help of Franny's future self, Johnny the Homicidal Maniac, an alien girl named Deadly and a woman named Doomsbury, it's up to Dib and Franny to save the day.
The fic presently has 13 chapters and has not updated since January 16, 2007.
You can start reading the fic here: https://www.fanfiction.net/s/3295716/1/invader-Franny
- Bad Future: 20 years from now, Dib has gone crazy and decided to murder everyone as payback for being dismissed as crazy.
- Big Bad: The main villain is Dib's evil future self Dark.
- Continuity Nod: Franny mentions some events from her book series, such as when she tried to use time-travel to change her middle name in The Fran That Time Forgot.
- Crossover: The fic is a crossover between the Nickelodeon cartoon Invader Zim and the children's book series Franny K. Stein, plus Nny appears as one of the allies summoned by Franny's future self Fran.
- Dead Fic: The fic hasn't been updated since 2007 and was left on a cliffhanger where Franny, Dib and their surviving allies prepared to face Dark.
- Disproportionate Retribution: Franny creates a monster to maim and kill several of her classmates just for teasing her about being Dib's "girlfriend".
- My Future Self and Me: Dib and Franny end up teaming up with Franny's future self to take down Dib's future self.
- Out of Focus: Franny's dog Igor only gets a brief mention in the first two chapters, with her parents and brother getting no acknowledgement whatsoever.
- Rouge Angles of Satin: The fic is rife with spelling and grammar errors, one of the more notable ones being that characters constantly say "mine" instead of "my".
- Self-Made Orphan: Dib's future self Dark ends up killing his father Professor Membrane.
- Shipper on Deck: Professor Membrane appears to really want Franny to be his son Dib's girlfriend.
- Surrounded by Idiots: Franny dismisses all the children at Skool except Dib as being "bloody idiots".