Almost from the start they have been a fan favourite, with my personal favourite artist John Byrne evening drawing the comic.  And they have some great adversaries too including Doctor Doom, Silver Surfer and the planet devouring Galactus!

Over the years the Fantastic four have appeared in animated series, including the 1978 one without the Human Torch (due to copyright reasons), to several big budget movies, with varying degrees of success.  The last outing was not well received, and the Roger Corman version never even released - you can find it online.

More copyright issues led to the Fantastic Four even disappearing from the pages of Marvel comics until recently.  And that return means, yes, a return to Heroclix.  And with the Fantastic Four returning, Galactus is not far behind!

Quality of sculpts 4
Character selection 4
Playability 4
Overall 4

A nice mix of characters and abilities.  The set also spans low lost figures to higher ones like God Emperor Doom.  I'm marking the character selection down by 1 purely for the lack of She-Hulk.

The new Cosmic Clash starter set

Thundra is a warrior woman and time traveller from an alternate future 23rd century. In the future society she hails from, planet Earth is now known as Femizonia and is ruled by Amazon-like female overlords (Femizons) who have conquered and enslaved the diminished male population.

She is sent to the 20th century to challenge Fantastic Four member the Thing to a bout of one-on-one combat, believing him to be the strongest male of all time. By beating the Thing in combat, she feels she can prove once and for all that women were superior to the male gender.

https://en.wikipedia.org/wiki/Thundra

Trapster is a super villain who has fought the Human Torch, Fantastic Four and Avengers. While he has no super powers he uses a combination of high technology to aid him in combat. He has also been a member of various criminal groups including the Frightful Four and Sinister Six.

https://en.wikipedia.org/wiki/Trapster

Pyreus Kril was born on the planet Xandar, an a member of the Nova Corps.
When searching for his missing friend he ends up making a deal with Galactus who turns him into his Galactic Herald, Firelord.

https://en.wikipedia.org/wiki/Firelord_(comics)

Klaw was a physicist, working in the field of applied sonics. In order to build a sound transducer which converts sound waves into physical mass, Klaw steals the metal vibranium to power his device. This is a metal substance known to exist only in Wakanda. Klaw comes into conflict with the Wakandan ruler/superhero T'Chaka whom Klaw murders in cold blood. T'Chaka's adolescent son T'Challa then attacks Klaw to avenge his father. Klaw manages to escape at the cost of his right hand.

Years later, Klaw resurfaces with a sonic emitter/gun on his right wrist as a replacement prosthetic device for his missing hand that can create any kind of object or creature he can conceive by only using sound.

Andy Serkis portrays Ulysses Klaue in the Marvel Cinematic Universe.

https://en.wikipedia.org/wiki/Klaw_(Marvel_Comics)

Triton is member of the Inhumans' Royal Family, son of Mander and Azur, brother to Karnak, and cousin to Gorgon, Black Bolt, Maximus, Medusa, and Crystal.  His abilities include Underwater breathing, Aquatic vision, Superhuman strength, stamina, speed, durability, agility, and enhanced reflexes.

https://en.wikipedia.org/wiki/Triton_(comics)