Viktor led the team that constructed Blitzcrank, the first steam automaton which obtained sentience.
Unfortunately Viktor's triumph was usurped by Professor Stanwick, who stole credit for Blitzcrank's creation.
Viktor's research was later used to reconstruct and revive Urgot.
From the Journal of Justice, Viktor is possibly the perpetrator who held Warwick in captivity: "The gutless vermin was a man, at least I think it was a man, wearing a Zaunite radiation suit. When he spoke, his voice was deep and robotic, like what you'd expect if Blitzcrank had a cold. He wasn't a robot though, he was a victim of a Zaunite bio-assault - or so I would guess."
Viktor views Jayce, the charismatic inventor from Piltover, as an obstacle to his "glorious evolution". One that he must overcome.
Viktor defeated Jayce and stole a powerful arcane crystal to power his creations. Jayce later created the Mercury Hammer and counter assaulted Viktor's laboratory, destroying Viktor's prototype weapons.