Tweedledum and Tweedledee
Tweedledum and Tweedledee were characters from Alice Through the Looking Glass by Lewis Carroll. They were brothers discovered by  as she traveled through Wonderland.

In 2268, under the control of the Platonians' psychokinetic abilities, James T. Kirk and Spock sang a nonsense verse that referenced language and characters from the book:

I'm Tweedledee, he's Tweedledum.
We're spacemen marching to and from.
We slythe among the mimsy troves,
And tire among the borogoves. ()

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Fictional characters