Space Age (S03E06)

In the future Earth is overpopulated and, rather than end their days in a retirement home, elderly astronauts Dudley and John travel trough space in search of a distant planet to colonise. Dudley wakes John from hyper-sleep to take his six month shift as sentinel officer but John is perturbed that Dudley has been teaching their logically-minded computer Iris human traits and his fears are justified when Iris's desire to live forever sends the ship off course. Though the pair get it back on track their worries are not over when they get a message from their mission destination. (Cinemax)