Tommy

Tommy – Be All My Sins Remember’d (4×11), Spoils Of War (4×12), Midway (4×17) –
Brendan Penny in Midway but conflicting information about who played him in Be All My Sins Remember’d and Spoils Of War.

WDC members decided that the Wraith in BAMSR and Spoils was the same one as in Midway because of the facial hair and distinctive chin tattoos. We have no idea how he managed to escape being blown up in Spoils, though.

He is also the Wraith known as Ember in the Stargate: Legacy book series, according to this blog by Melissa Scott.

Bullseye

Bullseye
First Contact (5×10)/The Lost Tribe (5×11)(speculation) –
actor is a bit of a mystery.

GateWorld Episodes and Stargate Wiki conflict on who was in First Contact. Stargate Wiki says James Chutter as “Billy”, Brendan Penny as Wraith. But GateWorld doesn’t list Brendan Penny amongst the episode guest stars. Meanwhile the IMDb page for Brendan Penny doesn’t say he was in First Contact either. James Chutter is a male Wraith in The Lost Tribe and WDC members agreed that this photo is his character.