Heather Rat is a greedy millionare and a minor character in The Chronicles of Thorn Valley.

Heather briefly appeared in the episode The Monkey King when Jenner sent her off to pick a fight with Justin. She is also a con artist who had made a deal with him.

Heather returned in the episode That's What Friends Are For. She and her goons chased Mrs. Brisby and some of her friends through town and tried to lure them. But when Heather failed to catch Mrs. Brisby - She and her henchmen were arrested.