Tunnel Vision (episode)

Having discovered the locations of four relics from the Vaults of Iacon hidden across the globe, the Autobots split up into small groups and head to each location simultaneously to retrieve them. Arcee, Bumblebee, Jack and Miko travel to New York City to find the first relic, a Phase Shifter, a device that enables its user to walk through solid objects, which is buried deep in the city's underground subway tunnels. During their search however, Arcee and Bumblebee are attacked by Knock Out and an Insecticon.