When the earth was eventually destroyed, the Starship UK went into space to search for a new home. They survived by latching themselves to a Star Whale, the last of it’s kind,  who they constantly electrocuted parts of to  keep it moving through space. Unaware that the whale was happy to volunteer  to carry the craft, the humans aboard it assumed they had to hurt it to keep it moving. When the Doctor and Amy arrive onto the Starship UK, Amy puts a stop to the continuous torture of the whale. The whale begins to move faster and happier now that it was free to move around without pain, while still carrying the spaceship on it’s back.

 

The Star Whale was seen in The Beast Below