The Unstoppables vs The Diabolicals

'The Unstoppables! vs The Diabolicals' was the sixth season It began on September 8, 2021, with the release of the Fallout Worlds update. It follows Escape from the 42nd Century and was followed by Zorbo's Revenge.

Background
''The Unstoppables! vs The Diabolicals'' is a board game based on The Unstoppables!. It is part of Unstoppables! series of comics, published by Hubris Comics. The game introduces three new super villains - Catarax, Pyramind and SamurEye. Banded together against The Unstoppables!, they are The Diabolicals.

Rewards
After rank 130, the rewards from ranks 101-130 repeat.

Bugs
The Unstoppables! vs Dr. Brainwash Poster preview image is missing.

Behind the scenes

 * The Season 6 promotional trailer featured a player wearing the Bowling Team Underarmor, an item that has never been made available.
 * The Unstoppables! vs Dr. Brainwash Poster was made available to all players in the Atomic Shop on September 7, 2021 for . It was removed on September 8, 2021.
 * The Grognak the Barbarian Posters, which feature Grelok, were advertised as being included in the scoreboard. They were instead listed in the Atomic Shop for on September 8, 2021.
 * Although they were featured in the promotional video as SCORE rewards, the following items never made it into the final scoreboard:

Gallery
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 * Video