Rhino ( Alex O'Hirn)

The Rhino is a former student at Midtown High, and current Sinister Six-er.

Origins
Alex O'Hirn was a nerdy student at Midtown High School who seemed to have everything against him. In addition to being constantly picked on by Flash Thompson, the school bully, he lost an internship at OsCorp to Peter Parker. Sometime after, Alex somehow got his hands onto one of Doctor Octopus' samples of mutagenic animal DNA. O'Hirn ingested the sample to become the monstrous Rhino, and sought his revenge on Thompson. Rhino then trashed Flash's car and tracked him down to his home. Spider-Man and Power Man were barely able to stop the rampaging monster, and O'Hirn was taken into S.H.I.E.L.D. custody. Before he was taken away, however, Flash apologized for the years he bullied him.

Sinister Six
The Rhino became part of The Sinister Six when Dr. Octopus promised him more Rhino serum. Spider-Man tricked him into flooding Dr. Octopus' underwater lab in the Hudson River. He was part of the second Sinister Six, and was put in an armored suit. He was defeated by The Green Goblin along with the other Sinister Six.