The FF aren't a building, Johnny. Or matching outfits. Or even a team. We're a family. And that will never change. 
Appearing in "Irreplaceable"
Featured Characters:
Supporting Characters:
- Fantastix (First appearance)
- Hope
- Ms. Fantastix (First appearance as Ms. Fantastix)
- Iceberg (Jack)
- 2-D (Darell)
- Future Foundation
- Brainstorm (Valeria Richards) (Leaves)
- Powerhouse (Franklin Richards) (Leaves)
Antagonists:
Other Characters:
- Numerous unnamed New Yorkers
- Fact Channel News
- Byron Ford (First appearance)
- Brenda Bannicheck (First appearance)
- Iceman (Bobby Drake)
- She-Thing (Sharon Ventura)
- Prince Arboro
- Luke Cage
- Storm (Ororo Munroe)
- Namorita
- Jessica Jones (Mentioned)
- Dani Jones-Cage (Mentioned)
- Future Foundation
- Black Panther (T'Challa)
- H.E.R.B.I.E.
- Hulk (Jen Walters)
- Inhuman Royal Family
- Ant-Man (Scott Lang)
- Molecule Man (Owen Reece) (Mentioned) (Deceased)
- Griever at the End of All Things (Mentioned)
- God (Yahweh) (Invoked)
- Ms. Thing (Darla Deering)
- Ghost Rider (Daniel Ketch)
- Spider-Man (Peter Parker)
- ⏴ Logan ⏵
- New Fantastic Four (Mentioned)
- Avengers (Mentioned)
- Ghost Rider (Robbie Reyes) (Mentioned)
- Dr. Bruce Banner
- Parker Industries (Mentioned) (Defunct)
- Deadpool (Wade Wilson) (Mentioned)
- Uncanny Avengers (Mentioned)
- Annihilus (Mentioned)
- Alicia Masters
- NYPD
Races and Species:
- Human
- Mutants
- Unidentified alien species
- Atlantean-Human Hybrids
- Uhari
- Poppupians
- Robots
- Moloids
- Inhumans
- Demons
Locations:
- Multiverse (Mentioned)
- Prime Marvel Universe
- Earth
- United States of America
- New York
- Philadelphia, Pennsylvania (Mentioned)
- Wakanda (Mentioned)
- United States of America
- Hell (Invoked)
- Earth
- Unidentified reality
- Prime Marvel Universe
Items:
- Bulldozer's Helmet
- Wrecker's Crowbar
- Thunderball's Ball and Chain
- Fantastix Flare Gun (First appearance)
- X-Uniforms
- Transmaterializer (Rebuilt)
- Fantastic Four Uniforms
- Panther Habit
- Ant-Man's Suit and Helmet
- Thing Exoskeleton
- Spider-Man's Suit
- Web-Shooters (Behind the scenes)
- Stellarex Stone (Behind the scenes)
Vehicles:
- Future Foundation's ship
- Fantasti-Car MK I
Synopsis for "Irreplaceable"
- Synopsis not yet written
Solicit Synopsis
Meet the Marvel Universe’s New Fabulous Foursome: THE FANTASTIX!
• Wait. What?! Who are these imposters? Why are they in the Baxter Building?!
• And how is it that they own the lease?!
• A strange new turn in the Fantastic Four’s legacy!
• A secret side mission for the Thing!
• All this and a special appearance by one of the FF’s oldest foes!