- Negaduck (leader)
- The Liquidator
The Fearsome Five was formed by Negaduck in "Just Us Justice Ducks" in an attempt to take over St. Canard. Using their combined powers they cut off all supplies to the city by creating a large electric barrier, preventing anyone from entering or leaving the city. Their plans were eventually thwarted by the superhero team The Justice Ducks.
The Five later appear in the episode "Jail Duck" where Negaduck uses the Mystic Eye of Quackzecotal to steal the super-powers of all four of his team-mates, transforming into Mega-Negaduck. Interestingly, in this episode Darkwing was able to swiftly defeat the Five without the aid of the Justice Ducks. He later teams up with Bushroot, Liquidator, Megavolt, and Quackerjack to stop Mega-Negaduck.
The Fearsome Five are seen again in "Life, The Negaverse, and Everything" where it's made clear that Negaduck cannot stand being around his team any longer than necessary. While the other four enjoying "hanging out" in their spare time, Negaduck prefers to keep it strictly to high-profile crimes. Despite being the smallest in size and only character without a significant super-power, Negaduck manages to rule his team through fear tactics.
The Five also appear in "The Darkwing Doubloon" as Negaduck's pirate crew. In the Negaverse, the alternate versions of Megavolt, Quackerjack, Bushroot, and The Liquidator are a superhero team known as The Friendly Four and later Darkwing's Ducks.
- Just Us Justice Ducks (Parts 1 and 2)
- Life, The Negaverse, and Everything
- Darkwing Doubloon
- Jail Bird