Ep 5. The Russian Rocket Reaction

When Howard discovers that the Russian cosmonaut he beat up at the International Space Station is actually coming to visit him in California, he's thrilled. However, his excitement is quickly dampened when he learns that his old foe is a trained fighter and may be coming for revenge. Meanwhile, Sheldon is grappling with jealousy after Amy introduces him to her new date, and turns to Leonard for help navigating his feelings. As tensions between the two friends reach a boiling point, the gang organizes a series of competitive challenges to determine who truly is the best scientist among them. With the stakes higher than ever before, the team must pull together to triumph in the face of adversity. Will Howard be able to overcome his Russian rival? Can Sheldon and Leonard mend their broken friendship? Find out in this thrilling episode of The Big Bang Theory.