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 appears to have a low opinion of his Earth One counterpart, describing the advice he gave Barry in "Infantino Street" as "terrible advice". He also didn't seem very fond to learn Earth One Leonard was a thief and a murderer. 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
Dr. Sharon Finkel
Grief is a complex emotion that, as you know, deals on its own terms. There is no "practice makes perfect."
References Back to the Future