The Codpiece Topology

Summary
Penny is dating a new guy, so Leonard jumps at the chance to date Leslie Winkle again. Sheldon hates Leslie and resents being exiled to the staircase to play Mario alone. Eventually he confronts Leslie about her scientific beliefs and when Leonard doesn’t agree with her she leaves.

Critics
"The Big Bang Theory has good comedy writers. This episode sparkles with fun one-liners, insults and gags. But those writers need to focus on stories and characters which will hook a loyal audience. Sheldon dominating every scene will eventually become tiresome and the wealth needs to be shared around the group. But for now this is a fun episode." - The TV Critic's Review