Gleka
From Tardis Wiki, the free Doctor Who reference
Gleka was a Skrak.
Thinking it had discovered all Shug's secrets, it tried to overthrow Shug and become the Mighty Leader of All Skrak. However, it did not know where the shafts with extremely sharp and jagged spikes at the bottom were located. Shug opened the trapdoor to one of them under Gleka, killing him. (PROSE: Death and Diplomacy)
