F4-MF spearheaded the "Rebel Four," a highly skilled unit composed of Rebel Alliance operatives. F4 resembled an assassin droid sharing its model with IG-88. In contrast to typical assassin droids, F4 stood out as a courageous and honorable champion of righteousness.
During an attack on a squad of stormtroopers within an Imperial facility situated on the planet Vatleria, F4 and his Rebel Four comrades were ambushed by Darth Vader. Vader apprehended the team and subjected them to brutal executions. F4 met his end by being torn asunder by powerful equipment.
Similar to his Rebel Four companions, F4-MF serves as a comedic imitation of a member from the superhero comic book team, the Fantastic Four. The designation F4 represents Fantastic 4, while MF alludes to Mister Fantastic, also known as Reed Richards. F4's role as the team's commander, alongside his death by extreme stretching, are also allusions to Mister Fantastic and his powers of bodily elongation.