As in Stargate: Atlantis (2004) Poisoning the Well (2004), Allison Hossack (Zenna Valk) plays a scientist who is working with a potentially dangerous medicine and develops an attraction to one of the main characters.
"Qu'est-ce que c'est?" as spoken by O'Neill when handed the vial of Tretonin, is French and translates to "What is that" or "What's this?"