S7·E24 What Women Don't Want

Lewis struggles to find a date to his ex-girlfriend's wedding. All of his friends (and even Mimi) try to help him out, but he inevitably drives all the women away with his creepy comments. Lewis becomes extremely depressed and refuses to get off of Drew's couch. Oswald brings in Lewis's mother, who reveals to Drew that Lewis has an IQ in the genius range. His family always kept the truth from him in the hopes that he could live a normal life. Lewis is thrilled by the news. He attends a Mensa meeting, but still strikes out with every woman. He begins to fear that he will never fit in, until a woman shows up at the meeting to deal with the building's rat problem. She has a high IQ and shares Lewis's love of bizarre trivia about serial killers, etc. They immediately establish a connection and set off to catch the rat together.