Season 4 Episode 2 - The Other Side

The SGC is contacted by Alar, a representative of the planet Euronda. His people, who claim direct descent from Earth, are under attack and in need of help. General Hammond sends SG-1 on a humanitarian mission to deliver food and medical supplies. SG-1 arrives to find a civilization devastated by war - and a leader desperate to make a deal. In exchange for the heavy water they need to sustain their defensive fields, Alar is prepared to offer advanced Eurondan technology. O'Neill quickly agrees to the trade. Daniel, however, is suspicious that the Eurondans have not been completely honest about their agenda and sets out to discover the truth.