Fusion creature

Meltdown's experiments are failed attempts at forced evolution from the Animated continuity family

Meltdown's greatest dream is to create the organic equivalent of a Transformer; a human that can take on any form it desires. To that end, he attempted to genetically manipulated two adult humans (one of whom happened to be his lawyer). Sadly, the experiments failed, and he was left with a pair of hideously mutated beings, which may be as powerful as one of Prime's Autobots, but fall short of the glory Meltdown was aiming for. They now act in a similar capacity as Colossus Rhodes, playing the role of loyal enforcers/bodyguards.

Fiction

Animated Continuity

Meltdown created the pair on Dinobot Island, and while he attempted a similar experiment on Sari Sumdac, he left Prowl and Fanzone to battle the mutants. The pair managed to hold their own and escape, capturing Meltdown in the process. The mutants and Rhodes tracked them down, but were soundly walloped by the Dinobots. Survival of the Fittest

Plot details for Black Friday (episode) follow. Spoilers have expired, you may remove this tag

Later, Meltdown used the pair to keep Optimus and Grimlock occupied while he experimented on Blackarachnia. Unfortunately for him, Swoop and Snarl showed up and ended the fight early, causing the mutants to run away in terror. Black Friday

Trivia

• The experiments appear to be modeled after the Pretenders Bomb-Burst and Submarauder.
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.