Rack'n'Ruin

Rack'n'Ruin is the name of a fictional character in the Transformers universe.

Marvel Comics
Rack'n'Ruin were members of the Autobot sub-faction known as the Wreckers. They had the distinctive feature of being the only Siamese twins on Cybertron. Rack'n'Ruin used to be normal individual Autobot soldiers who could transform into Cybertronian jets. However injuries required Autobot medics to fuse the two robots together to keep both alive. They are unable to transform, however they have interchangeable hand weapons they can use in combat. Rack'n'Ruin were not included in any other fiction, not even Dreamwave and IDW's reboot of Generation 1, until they appeared for a grand total of two panels in Last Stand of the Wreckers.