Fantastic Four #366
- Series: Fantastic Four
- Issue: 366
- Publisher: Marvel
- Published Date: July 1992
- Cover: Paul Ryan
- Writers: Paul Ryan, Tom DeFalco
- Pencil: Paul Ryan
- Ink: Paul Ryan, Danny Bulanadi
- Appearances: Mister Fantastic, Dark Side Mr. Fantastic
- Additional Notes: Direct
"The Enemy Within!"
With the Fantastic Four dealing with domestic troubles following their return from Innerspace, Mr. Fantastic is attacked and defeated by his evil Magus doppelganger who ends up replacing him.
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