When Barry needs help transporting a dangerous meta, he calls on an old friend for help - Leo Snart AKA Citizen Cold. Meanwhile, Cisco becomes suspicious of Harry.
Did You Know?
Leo mentions how Barry can literally run "back to the future", referencing the film series of the same name. See more
In Cisco's summary of the various Canaries, he says that Sara Lance was the first Black Canary. In fact she was never named Black Canary. She began as Canary and was later donned White Canary. See more
Why such turmoil in your mind, Mr. Allen? Allow me to ease your pain.
References Mad Max: Fury Road