The 8 bits are an oppressive group of treacherous monsters led by Wart that seek to dominate the Subcon. They serve as the antagonists of the games Doki Doki Panic and Super Mario Bros. 2, as well as the latter's remake Super Mario Advance, and the Japanese exclusive sequel to it BS Super Mario USA.
It is stated in the manual for Super Mario Bros. 2 that they were created by Wart messing with the Dream Machine, though some members such as Tryclyde were originally recruited from outside the group.
Wart uses his army to help him conquer the Subcon. In response to Wart's invasion, the people of Subcon contacted Mario and pleaded for his help in defeating Wart. Mario, along with Luigi, Peach and Toad, later found his way to the Subcon. The four fought and defeated the major members of Wart's army (Mouser, Clawgrip, Fryguy, Birdo and Tryclyde) before eventually reaching Wart himself and defeating him using vegetables, freeing Subcon from the 8 bits' grasp.
However, in BS Super Mario Bros. USA, it is revealed that the 8 bits escaped after their defeat and laid low in another dream. Eventually, they invade Subcon once more, forcing its King to ask for Mario's help once again. Like in Super Mario Bros 2, Mario and co. venture through Subcon and defeat the 8 bits and Wart.
- Their name is a reference to the size of the Ricoh 2A03/2A07 processor's CPU registers: 8 bits.