The War of the Pom-Poms - S2.E14

A transfer student, Heather, is great and cheerleading and is voted as the squad's new co-captain. Jessica, jealous and angry over Heather's elected position, quits the squad and tries to form her own. When her squad is short a member, she blackmails Liz into joining the team by threatening to tell that Elizabeth dated Ken while Todd was away in Vermont.