Jackson and The Argonauts take Team TARDIS to a newly formed, largely green-screen’d planet
Leela is taking the TARDIS for a spin whilst the Doctor plays painter in his smock. They happen upon the gravitational pull of a brand new sun and thus cross paths with a similarly affected Minyan spaceship, who have been on a quest for one hundred, thousand, yeeeaaars. It seems the Time Lords royally fecked up the civilisation on Minyos and the Minyans are searching for a colony craft that contains the genetic material to restart everything on another planet. One they’ll imaginatively call Minyos 2.
However, the colony ship has accidentally turned itself into a planet over the last one hundred thousand years and the descended inhabitants have naturally split into worker and abuser factions. Said workers now spend their lives eating gravel and mining in the tunnels of the spaceship-planet. So you can bet your bottom dollar that Doc, Leela, K9 and the rescuing Minyan crew members will spend the rest of the serial running and fighting in fake tunnels to rescue the miners, overthrow the abusers and steal some genetic shit on the way.