What links a disintegrating spaceship to a posh garden party, where a wealthy couple are celebrating their love for each other in style? Gatecrashers the Doctor and Lucie think they know the answer. But they're not the only uninvited guests - ferocious alien warriors riding pterodactyl-like Vortisaurs are about to make their entrance!

Featuring the song Bucimeana, sung by Julia McKenzie with music by Tim Sutton and lyrics by Paul Sutton from a traditional Hungarian poem