Phineas Mason is a former salvager with a gift for engineering. As he and the rest of the crew led by Adrian Toomes turned into professional criminals, Mason, under the alias of Tinkerer used the Chitauri, Dark Elf and Ultron technology salvaged to create all new powerful weaponry. Due to the actions of Spider-Man, Tinkerer's weapons came under risk of being found, and therefore, Toomes considered shutting down their organization. However, the Tinkerer convinced him to do a final heist which resulted in Toomes being arrested.