Geldaran scientist under the leadership of Nola, resident of the planet M4D-058 in the Pegasus Galaxy. Following instructions provided by Rodney McKay by means of The Portal, Garth developed and tested a steam-powered dirigible air vessel. Subsequently he turned his engineering talents to work on a tactical explosive device. Putting the two technologies together introduced the possibility of delivering an airstrike on the Geldarans' enemy, the Hallonans.
Garth set himself to delivering the bomb himself, targeting an outlying Hallonan village. But John Sheppard shot down his dirigible, causing to fall harmlessly to the ground. Garth likely survived, though he may have fallen into the custody of the Hallonans.
The Game - Despite Rodney's protests, Garth declares his intentions to fly a dirigible to drop a bomb on Hallona.