S1·E4 Coming Home

When the younger team members reminesce about birthday's, Ec'co thinks back to his own torn life. The team convinces Gus to take Ec'co to his homeworld. An electrical storm shorts out their Stargate while Gus and Ec'co get taken into custody by the hostile Hrathi, who know of Gus' alleged betrayal. The rest of the team rig a way to recharge the Stargate using lightning while the Tlak'khan launch an attack on the Hrathi. Gus helps to drive them off and then are taken to a cache of data crystals. It turns out the crystals are a fake, but one of the Hrathi reveals he is a shapeshifter. Gus and Ec'co pass the test and receive the real Tlak'khan data crystal they need.