Three million years ago, a radiation leak killed the crew of the mining ship, Red Dwarf. The only survivor was Dave Lister, the chicken soup machine repairman. He spends his time on the ship with a holographic projection of Arnold Rimmer (his dead bunkmate), Cat (a life-form that evolved from Dave's cat), Holly (the ship's senile computer), and Kryten (a service mechanoid).

3 Million Years from Earth, the mining ship Red Dwarf
Its crew:
Dave Lister, the last crew member alive
Arnold Rimmer, a hologram simulation of his dead bunkmate
Cat, a humanoid who evolved from Lister's cat.
Additional:
The ship's crew has come across new members:
Kryten, a series 4000 mechanoid rescued from the Nova 5
Navigation Officer Kristine Kochanski, from a parallel universe.
I am Holly, the ship's computer with an IQ of 6000 (and rapidly decreasing). Message Ends.