The Flash Supergirl Musical Crossover: 14 Easter Eggs & References In 'Duet' You Need To See
5. Mocking Superman
One of the funniest moments of the episode comes during the performance of the song Super Friend, when Barry pauses with the singing to make a mention of Kara's rather more famous cousin, and then totally mocks him (with a "really good impression").
It's a lovely lighthearted moment that plays up the friendship between the pair, and also acknowledges just how much the shadow of Superman loomed large over the first season of Supergirl, and how Kara has had to move out of it.
It's also a bit of a nod to the dynamic between The Flash and Superman in the comics, who have something of a longstanding rivalry over which one of them is the fastest, with the odd bit of friendly 'banter' between them as well.
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