Definitely hard to narrow down the titles to just the top three but...

1. "Separation Anxiety" (UF/FI) -Always did have a soft spot for Cassandra.
2. "Weltanschauung" (especially if we could get some of the behind the scenes shenanigans :)
3. "The Other Side" (UF/FI) - Ghostbusters. in UF. Fantastic!

with special quirked eyebrow for

"That Which Does Not Kill Us: Act II" (UF/FI)

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"I recognise my failing and will be sure to correct it." -saying of the Vlka Fenryka