The Bon Voyage Reaction

"The Bon Voyage Reaction" is the twenty-fourth episode and the season 6 finale of the sixth season of the American sitcom The Big Bang Theory. The episode will aired on May 16, 2013.

Summary
Howard learns of a Stephen Hawking related expedition in the North Sea and suggests Leonard for an opening in the team. Sheldon is clearly unhappy with Leonard leaving and getting an opportunity not offered him and mentions that his relationship with Penny might suffer. Raj suggests that Lucy meet just one of his friends. Penny accepts Leonard being away on a once in a lifetime expedition. Raj and Lucy have dinner with Amy and Lucy still runs away. The gang plans on giving Leonard a going away party which Raj convinces Lucy to come too. Everyone is wishing Leonard well including Sheldon who gives a quick off-the-wall toast. Lucy texts Raj that their relationship is too much for her and that they shouldn't see each other anymore. Sheldon and Penny drop off Leonard at the airport as they tell each other goodbye and "I love you". Penny stops by to check on Raj, who is complaining that he can't find anybody to love him. Then, they both realize that he hasn't had a drink since last night and is talking to Penny. In the final scene, he is with the girls at Penny's and they can't get him to stop talking.