Penny informs Sheldon that she intends to give gifts to him and Leonard on Christmas which happens to be around the corner. After considerable debate with Penny, Sheldon agrees to also give a gift to Penny on Christmas. However, in the dilemma of presenting Penny with a correctly valued gift, Sheldon buys multiple basket sizes of the same bath item gifts, intending to gift the correct size according to Penny's gift and return the rest of the baskets for a full refund. At the same time, Leonard starts working with David Underhill (Michael Trucco) — the winner of the MacArthur Genius Grant — who starts dating Penny. Seeing Penny get interested in Science because of David, Leonard starts to get jealous and ends up confronting Penny about his feelings. Penny then informs Leonard of her breakup with David after she found naked pictures of his wife on his cellphone when he tried to snap naked pictures of Penny. On Christmas Eve, Penny gives Leonard a gift certificate to motorcycle lessons — since it was the reason why Leonard hurt his leg — and Leonard gives Penny 101 Scientific Experiments for Kids — for her fake interest in Science while dating David. Penny then gives Sheldon a personally autographed napkin from Leonard Nimoy that he used to wipe his mouth, addressing Sheldon directly by his first name as a gift. Realizing the value of the gift and the DNA ("All I need is a healthy ovum and I can grow my own Leonard Nimoy!"), Sheldon proceeds to give Penny all the bath item baskets he bought for her. Since these were still not enough by Sheldon's standard, he proceeds to give Penny an awkward hug.

Michael gets medical attention from the most unlikely of places, and Westmoreland returns to help uncover the true meaning of Scylla. Meanwhile, Lincoln and Sucre race to stop Gretchen before Scylla is lost forever.

Christmas Eve does not go as planned when an amateur criminal on the run from the police crashes into the Buy More and takes Chuck, Ellie, Awesome and the rest of the Buy More gang hostage. In order to protect Chuck’s cover and the safety of the other hostages, Sarah and Casey secretly go in to the store to remove Chuck, but the mission quickly falls apart when Chuck refuses to leave his friends and family behind. Al Powell is a reference to Die Hard. Ned Rhyerson (the hostage-taker) is a reference to Groundhog Day. LT. Mauser is a reference to the Police Academy films.

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After the showdown with Arthur, the Petrelli brothers find themselves against each other and Nathan makes a move that will have repercussions on the world. Sylar holds Claire, Noah, Meredith and Angela hostage, beginning a face-off at Primatech. Ando, Matt and Daphne continue their attempts to rescue Hiro from the past and Mohinder may be their only hope of achieving it.