Origin of the Fantastic Four,
Part 1
(Episode 1)

The origin is revealed to Dick Clark.

Origin of the Fantastic Four,
Part 2
(Episode 2)

The Puppet Master attacks.

Now Comes
The Sub-Mariner
(Episode 3)

The Sub-Mariner strikes.

Incursion of the Skrulls
(Episode 4)

The Skrulls invade Earth.

The Silver Surfer & 
The Coming of Galactus,
Part 1
(Episode 5)

Galactus arrives on Earth.

The Silver Surfer & 
The Coming of Galactus,
Part 2
(Episode 6)

The Silver Surfer saves Earth.

Super Skrull
(Episode 7)

Super Skrull has all of the FF's powers.

The Mask of Doom,
Part 1
(Episode 8)

Dr. Doom arrives on the scene.

The Mask of Doom,
Part 2
(Episode 9)

Doom tells Sue his shocking origin.

The Mask of Doom,
Part 3
(Episode 10)

The guys fight to save Sue.

Mole Man
(Episode 11)

The menance of the Mole Man.

Behold The Negative Zone
(Episode 12)

Annihulus and Blaastar strike.

The Silver Surfer & 
The Return of Galactus
(Episode 13)

The Surfer, Galactus, and Doom return.