Spider-Man: 043a - The Vanishing Doctor Vespasian

A series of bank robberies are taking place, with no evidence left behind. The robberies are the work of a group of thieves led by a chemist named Dr. Vespasian, who has created an invisibility formula called 'Invisoscine'. When Spidey investigates the robberies, Vespasian's dog, Brutus - who is also invisible - attacks Spidey. Brutus is thrown against a container of flour, which coats him & reveals him to Spidey. Spidey throws Brutus into a garbage can & traps him, but when police find signs of a struggle & pieces of Spidey's uniform, it is suspected that Spidey is dead.