With the Doctor about to be ritualistically sacrificed to appease the god Ti for stealing the dodecahedron, Meglos and the pirates return to Zolfa-Thura with the dodecahedron to fire up an ancient weapon and blast Tigella out of existence.
Did You Know?
In the original script, Lexa had simply vanished from the action once she had served her purpose within the narrative. Christopher H. Bidmead
suggested her act of self-sacrifice as a more dramatic end for the character. See more
[as the TARDIS resists dematerialization before an explosion goes off
It's time this thing had a thorough overhaul.