Star Trek: The Next Generation actors Jonathan Frakes and Marina Sirtis will make guest appearances in the Enterprise finale, it has been confirmed.

Speaking at a UK conference at the weekend, Frakes said that the pair - last seen together in Star Trek Nemesis - would be starring in a secretive plot for the show's last ever episode.

Filming is due to begin shortly before the episode airs May 13 on UPN in the States.