No spoilers, but there's a pretty major bombshell that closes out this episode. Which not only raises the stakes for the finale, but brings an otherwise gag-ridden episode to a heavy cliffhanger. That's the strength of 'Gramercy, Halberd!': despite the gang being stalked by (full-on Terminator) Barry, it's pretty much all jokes. Breezy, light-hearted, perfect for keeping momentum going.
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