Explain xkcd

Date: May 24th, 2011
From: Dan Hoey
Subject: Darmok and Jalad

That doesn't look too promising.  How about Belindi Kalenda from the
Star Wars universe?  Playing with Star Trek/Star Wars mashups is a
frequent source of humor, though I don't recall whether I've seen it
on xkcd.

Just to admit I'm not the world's biggest fan/nerd, I got the Belindi
Kalenda ID from the xkcd forum.