Hook, Line, and Sinker

Hook, Line, and Sinker are servants of Unicron in the Generation 1 continuity family.

Galvatron, Cyclonus, and Scourge got off easy, as far as names go.

Fiction

Marvel comics continuity

The characters were originally low-life criminals from the planet Ghennix. When Ghennix was destroyed by Unicron, the criminals attempted to flee in a small spaceship, but Unicron prevented their escape.

Instead of killing the criminals, Unicron reformatted them into three powerful assassins, whom he named Hook, Line, and Sinker. Each was given new weapons: Hook (not to be confused with the Constructicon of the same name) has a hook on one of his hands and a harpoon on the other, Line carries a sword and a net, and Sinker has two massive steel balls at the end of his arms.

Hook, Line, and Sinker's first mission was to fetch Galvatron from an alternate timeline, where the Decepticons had defeated the Autobots circa 2009. Galvatron was leading the Pretender Monsters onto a final victory march into New York City, when Hook, Line, and Sinker captured him and brought him to the "real" timeline, circa 1991.

Unicron intended Galvatron to serve as his chief assassin and Hook, Line, and Sinker to serve as Galvatron's aides. The four powerful creations assaulted Autobase. But, when Galvatron met Emirate Xaaron deep under the surface of Cybertron, he rebelled against Unicron and (at least apparently) sided with Xaaron instead. Through a psychic link, Unicron was immediately aware of this treachery, and sent Hook, Line, and Sinker to kill Galvatron. They failed, and Galvatron destroyed them instead.

Trivia

• Although Hook, Line and Sinker have never been represented as toys per se, the Club exclusive toy representing Astrotrain from the Unicron Trilogy includes three mini-cons named Astro-Hook, Astro-Line and Astro-Sinker. However they do not have any apparent connection to Unicron, or at least no moreso than any other mini-con.

• Though not related to the G1 characters, the Giant Planet Mini-Cons Longarm, Overcast and Deepdive were known as Hook, Line and Sinker in Japan.
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.