Sunder also known as Tetrahex Ripper is a character who appeared in the IDW Transformers comics. Sunder was an Autobot who used the Mnemosurgery technique, This allowed Sunder to enter the minds of his patients, but the more he used it, the faster he went mad, eventually going completely insane and becoming a serial killer.
Sunder first appeared in the comic Speak, Memory, where he is already on the verge of madness, due to his profession, already suffering from what he sees in the minds of others. Sunder tried to regain his sanity, but unfortunately it was no use. Later, Sunder really starts to go crazy and becomes a murderer known as the Tetrahex Ripper, but he is caught very quickly, thanks to Spectre, who was Sundera's brother, and also another psychologist, Froid, who compiled his approximate image.
However, during his imprisonment, Sunder developed Mnemosurgery and began hacking into the minds of others, without needing to have a physical body to do so. Thanks to this, Sunder controlled his brother Specter, and during the prisoner transfer, Sunder managed to escape, although Specter died in the process. However, Sunder took Froid hostage, Froid did not put up much of a fight, as he himself was impressed by Sunder and later joined him to study Sunder.