Doc Ock is one of Spider-Man's biggest enemies. Doc Ock is short for Doctor Octopus and the true identity of Doc Ock is none other than Otto Octavius. Otto was a fusion scientist before he epirimented on himself which led him to have 4 mechanical arms attached to his back. Hence giving him the name, Doc Ock.
You can find different variations of the Doc Ock mini figure in the following LEGO Sets: