Agatha Harkness Fact — November 3, 2026

Today's Fact

The black cat dozing on the new governess's arm in 1970 was the most dangerous member of her household.

AGATHA'S HOUSE CAT IS AN EXTRA-DIMENSIONAL CREATURE — THAT SWELLS INTO A DEMONIC PANTHER WHEN THE HOUSE IS ATTACKED!

The Featured Fact

Ebony arrived with Agatha Harkness in Fantastic Four Vol. 1 #94 (1970), perched on the arm of Franklin Richards' new governess and introduced in a single panel: “I am Agatha Harkness… and this is Ebony!” Marvel's own character history describes the cat as a powerful extra-dimensional creature held in psychic rapport with Agatha, who sees and hears through her familiar and occasionally casts spells through her.

The household found out what that meant when the Frightful Four came calling at Whisper Hill. Ebony's hackles rose first — her senses flagged the Wizard's approach before any alarm could — and when the villains pressed the attack, the housecat transformed into a massive panther. She drove the Wizard fleeing out of a window and into a tree, and the Trapster fainted outright at the sight of her demonic shape.

Later accounts only widen the résumé. Marvel notes Ebony can regenerate from virtually complete destruction and shift between panther and giant humanoid feline shapes, and its menagerie of Marvel animals records that she once injured Mephisto himself while in her demonic form. The creature Agatha carries like a pet has drawn blood from the Devil of the Marvel Universe.

Why It's Obscure

Whisper Hill's security system purred, shed on the furniture, and once mauled a lord of Hell.

1970

A quiet debut — Fantastic Four #94 introduces Ebony as set dressing on Agatha's arm, one panel before the Frightful Four test the house.

Not a cat

Extra-dimensional — Marvel calls Ebony a powerful creature from beyond this dimension, psychically linked to Agatha as her eyes, ears and occasional spell conduit.

The Wizard

Panther protocol — Attacked at Whisper Hill, Ebony swells into a huge panther, chases the Wizard out of a window and into a tree, and scares the Trapster into a dead faint.

Mephisto

She drew blood — In her demonic form Ebony has injured Mephisto, which puts the housecat ahead of most Avengers on that particular scorecard.

Gallery

Ebony appears in her ordinary cat shape in both period images below — her panther shape struck too fast for these panels, so nothing here is captioned as showing it.

Agatha Harkness holding her black cat Ebony, classic comic art — **The cat in her arms**Classic art of Agatha cradling Ebony in her everyday housecat form — the shape she wears between emergencies.

Fantastic Four issue 94 comic page introducing Agatha Harkness and Ebony at Whisper Hill — **You may enter**The Fantastic Four #94 page that started it all: the team arrives at Whisper Hill and Agatha introduces herself — and Ebony — at the door.

Agatha Harkness portrait art from Marvel — **The witch herself**Agatha Harkness in Marvel portrait art — governess, mentor, and keeper of the least ordinary cat in comics.

Sources

Every fact on this page was checked against at least two independent sources before publication.

Bullpen Bulletins

Meet the Mystical Menagerie — Marvel.comMarvel's menagerie: Ebony debuted alongside Agatha in Fantastic Four #94, transforms into a demonic panther-like form, helped defeat the Frightful Four, and injured Mephisto in that shape.
Agatha Harkness In Comics — Marvel.comMarvel's profile: Ebony is a possibly demonic cat that can regenerate from virtually complete destruction and transform into a panther or a giant humanoid feline, and through whom Agatha can see, hear and cast spells.
Agatha Harkness (Earth-616) — Marvel DatabaseThe full chronicle: Ebony's hackles warning of the Wizard, her transformation into a massive panther that sent him fleeing into a tree, and her description as a powerful extra-dimensional creature.