Lant Land

From Tardis Wiki, the free Doctor Who reference

Lant Land was a simulation game. The people who played it, however, found that the simulations, or Lants, were so realistic that they wanted to interact in the game themselves. They downloaded themselves into the simulants. In the process, however, the Lants died. The surviving Lants took their revenge by downloading themselves into the real people.

The Fifth Doctor, Tegan and Turlough found themselves in Lant Land, where they encountered two Lant Land characters, Simon and Joanne. (PROSE: Lant Land)