Four electricians, Dean, Junior, Ray and Shelly, are sent to cut off the power in a condemned building before it's torn down. They notice there's a difference between the floor plans and the actual size of the building. Upon breaking down a door they discover an old laboratory, which encloses an atomic pile (vintage nuclear reactor) powering a weird machine in the floor. They unwillingly set off an alarm and then boot up the device. Dean falls through a dimensional portal that's created and Junior goes after him, while Ray and Shelly read a journal left behind by the scientists. Dean and Junior appear outside in a deserted and web covered Chicago. Dean goes off to have a look around, while Junior waits for the others. Shelly, by reading the journal, realizes that the researchers were attempting to make a gateway to a parallel universe and he and Ray decide to step through the portal.