Hazel

Hazel is the 11th Doctor's first companion in Doctor Who - 03. She first appeared in The Sea of Monsters.

Meeting the Doctor
The Hazel met the Doctor when she saw him talking about aliens. Thinking he was mad, Hazel followed him to the TARDIS. After a bit, the Doctor admits he's an alien and admits he's met almost all of them. Hazel and the Doctor have an argument about him have meeting all the aliens, Hazel helps the Doctor stop the Sea Warriors from wiping out humanity. While the Doctor goes to train Scar, Hazel is left in a sinking submarine. The Doctor saves her. Hazel is dropped off while the Doctor rides the Scar to the Sea Warriors. He gives them a choice to leave the planet alone. After saying they would never, the Doctor Sonics the building, and rides Scar back to the beach. They look at the building while it explodes. The Doctor says goodbye to Hazel, but Hazel wishes to come with him. (The Sea of Monsters)