The Myrka was one of the most memorable monsters to appear in 1980s Doctor Who. FACT.
Those who witnessed its attack on a wobbly bulkhead door in the fifth Doctor tale 'Warriors of the Deep' cannot wipe it from their memory despite extensive therapy.
And the sight of Hammer legend Ingrid Pitt attempting to floor the terrifying creature with a Kung Fu move straight out of the choreography for West Side Story is still burnt on the retina of many youngsters who were traumatised at the time.
For these reasons a toy based on the pantomime lizard was never released...