
The Natural
After escaping the Tlak'khan on a jungle world thanks to Harrison's flying skills (sort of), the team arrives on a sulphur-covered planet and bat-like inhabitants, the Har'un. With his jetpack damaged Harrison accepts an invitation to fly with the locals but doesn't do so well. Determined, Harrison keeps trying but is the only one in the group who can't manage. The planet is polluted due to the Tlak'khan's efforts and they send a team to attack - Harrison has to mount up to warn the others and manages to get the hang of it. the Tlak'khan refuse to learn from their mistakes and fall victim to the Har'un's gas bombs.
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More from this season

S1 E1
Decision
A group of trainees and their leader, veteran gate traveller Gus Bonner, must help an alien named Draga, who is being pursued by both alien forces and bounty hunters from Earth, get back to her homeworld.

S1 E2
Double Duty
The team stay on a jungle planet, cut off by Nephestis who has framed Gus as a traitor. The local Thorn aliens are dying of a disease which Gus believes he left there on a previous expedition. The others choose to head out with the Ancient chrysalis but are ambushed by the Tlak'khan but escape...as the chrysalis hatches and the winged Ancient escapes. The Tlak'khan leader De'kyll takes the Thorn village hostage and Bonner surrenders but the Ancient intervenes and the cadets take them prisoner (except De'kyll escapes). The Ancient learns English through Seattle and asks the team for help, and after being named Draga. Draga heals the ailing Thorn but knows nothing about the Stargates and remains with the team.

S1 E3
The Best World
The team arrives with a planet with a mysterious ""Guide"" stone which is immediately endangered by an earthquake. The team helps the natives, the Mou'a'dash, to recover it. While Harrison deals with being ""owned"" by a local native that rescued him, the Tlak'khan launch an attack. Gus, Draaga, and Seattle get captured and taken through the Stargate along with the Guide, which they use to travel to the Ancients' home planet. They end up in a hellworld trap set by the Ancients, where the Stargate has no controls and they are stuck. Draga manages to use her powers to open the Stargate, leaving the Tlak'khan stranded. Gus realizes the Tlak'khan must have access to his travel record through the traitor and heads off to a planet he hasn't been on before.

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.