The Bath Item Gift Hypothesis

Summary
Wizard physicist and all round hunk David Underhill starts working with Leonard. He soon asks Penny out much to Leonard’s distress. He confronts Penny about why she isn’t with him and discovers David was married and Penny kicked him out. Meanwhile Sheldon heads to the mall to find a Christmas present which can adequately reciprocate whatever gift Penny gives him. He ends up buying a range of gift baskets so his options are covered. When she gives him a napkin signed by Leonard Nimoy, he gives her all the baskets and a hug.

Critics
"As a Christmas episode this definitely contains the feel good factor but more than that it is the best episode this season. Combining character development and humour in a blend which this show can do really well." - The TV Critic's Review