antilekrand
Antilekrand is a fictional element from the television series "Doctor Who," created by the British Broadcasting Corporation (BBC). It first appeared in the 2011 episode "The Impossible Astronaut." Antilekrand is a rare and highly unstable element that is the antithesis of lekrand, another fictional element from the series. While lekrand is a highly reactive and explosive substance, antilekrand is so unstable that it spontaneously decays into a cloud of smoke, making it virtually impossible to handle or store.
In the episode, the Doctor and his companions encounter antilekrand while exploring a crashed spaceship. The
Antilekrand has since become a recurring element in the series, appearing in several episodes and spin-off