Full Moon (unproduced TV story)
From Tardis Wiki, the free Doctor Who reference
Full Moon was the first of four The Sarah Jane Adventures Halloween specials proposed to be aired in 2011. However, due to the death of Elisabeth Sladen, it was never produced.
It would have seen Sarah Jane and her gang encounter the Pagan Gods Gog and Magog, who were trying to escape an alien spaceship.
It would have been followed by The Station, another special. (REF: DWMSE 32)