Teuthis

From Tardis Wiki, the free Doctor Who reference

Teuthis was an alien fish the Fifth Doctor found in Indian Ocean. The crew and prisoners of the Lady Juliana ate her children. She tried to adapt to Earth's atmosphere. The Doctor got Mary Wade to talk to her on behalf on the human race. She asked why the humans killed her children. The Doctor showed them a part of the ocean where they could survive in peace. (AUDIO: What Lurks Down Under)