One of the retailer incentive comics produced for IDW's Star Trek: Infestation #1 features hand-drawn sketches by Gordon Purcell.

I was curious about the work involved, so I emailed Mr. Purcell and this is what he told me:
So there you have it. 400 zombified Kirks, Spocks and McCoys out looking for Trekkie brains. Watch your back.

I was curious about the work involved, so I emailed Mr. Purcell and this is what he told me:
I did 400 covers for Trek: Infestation 1--about 200 Kirks, 100 Spocks and 100 McCoys. Some of the Kirks were from the waist up--others were head shots. I think there were more orders than IDW expected because I only had about 10 days to turn these around, so I had a lot of long days. I think they turned out well, so it was worth it. I also inked the second Trek:Infestation cover and drew 4 of the Godzilla incentive covers along the way. I hope to work on more Trek stuff for IDW--feel free to let them know!
So there you have it. 400 zombified Kirks, Spocks and McCoys out looking for Trekkie brains. Watch your back.