Thurishtia

Dark Lady Thurishtia or DLT as Donatello calls her, is the main villain of one of Donatello's Denotations. She is an evil Time Lord-like entity who captured Lord Simultaneous with the help of Savanti Romero. She then banished Romero to a labor prison when he tried to betray her. Renet freed Romero, as he was the only one with enough power to help stop Thurishtia. Romero suggests picking up Donatello to assist with repairing the Time Scepter, and the three of them defeat Thurishtia - but at the cost of Romero's life.