Jerrix was a commander aboard a Weapontek Battlecruiser. The ship was sent to an orbiting space station to collect the delivery of viable seeds stolen by the traitorous Professor Brask. The plants from the seeds, when exposed to even low levels of light, had an accelerated growth and an aggressive, carnivorous appetite. They were developed with the help of Professor Flynt as a solution to feeding colonists in difficult (i.e. low light) environments.
When the Tenth Doctor had restored control of the space station, he was able to use the stations tractor beam to hold and draw in the Weapontrek battlecruiser. Police were waiting. Jerrix and Professor Brask were arrested. (COMIC: Green Fingers)