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After the Ecto Vac failed to capture Slimer in its maiden trial, Professor Dweeb upgraded the device so it fitted on a suit mounted on tank treads. Dweeb took the Improved Ecto Vac into Central Park but ended up grabbing a gorilla instead of Slimer. After the gorilla screamed at Dweeb, the Improved Ecto Vac took off in Dweeb's Van.