The Adventures of Squirky the Alien Vol 04: Where Is My Mama?

Squirky and his sister Emma arrive at Planet S with the help of Mr Quentin and discover it's a scary place with freezing weather and purple monsters! 
 
However, things get less scary when they befriend a gentle purple monster called Crystal. Her mama has been missing for two days, and she's getting awfully worried! Squirky, Emma and Mr Quentin decide to look for Crystal's mama, even as they search for Squirky's birth parents. 

The Adventures of Squirky the Alien #4: Where is My Mama? is the fourth book in The Adventures of Squirky the Alien series.