Sinead is (obviously) Mr. Spock. Her ears and overall serious expression make this a pretty perfect fit, and this snappy shirt from Amazon fits her nicely. It even has an emblem on the back!
Liam's costume was a little more difficult, but in the end, I modified an old dragon costume and transformed him into a Gorn from Season 1. Not up on your Trekkie stuff? This might help:
Liam doesn't hiss and he's not quite the right color, but I think it's close enough!
So we're ready for Sunday! And next week, I'll have tons of photos to share. In the interim, check out my coverage of past crawls here and here.