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The Flash: "Enter Zoom"
Any big showdown with the main villain of your season that happens six episodes in is going to go badly. But this goes really badly. So badly it helps make up for some weird, uncomfortable awkward scenes where Cisco tries to vibe off Harrison-2 and Park-1 tries to pretend to be Dr. Light-2.
Basically, it's an hour of clsterfuck, but it's supposed to be, so it mitigated the parts of the clusterfuck that were clusterfucked, if that makes sense.
Agents of SHIELD: "Chaos Theory"