As the Global Dynamics employees celebrate the season at the company holiday party, staff member Dr. Noah Drummer (guest star Chris Parnell) nearly absconds with a volatile experiment. The halls get seriously decked when Dr. Drummer's unstable hydrogen crystal starts to grow at a frightening rate. Carter (Colin Ferguson) and Henry (Joe Morton) attempt to deal with the potentially explosive crystal, but before long the true scope of the problem is revealed, and it will take more than tinsel and carolers to save Christmas and Eureka.