How did I miss hearing about this? David Anders appeared on tonight's episode of "Undercovers" called "Assassin," which is episode #7. To avoid spoilers, I won't give out what his role was, but despite being a J.J. Abrams show, he does NOT play Sark. That would have been AWESOME, but it didn't happen. NBC must not have made much noise about Anders being on the show, because I usually get some sort of alert about the workings of former Alias actors.
In case you missed it, you can watch the episode through cable and satellite systems that offer NBC TV On Demand or online.