During routine administration at the Lyndon B. Johnson Space Center, Dr. Rhodes discovers that a comet has suddenly veered off its orbit and smashed into Mars. The explosion causes debris to travel towards Earth with the possibility of causing an extinction level event. At Ben Marshall's house, Ben refuses to give his son, Leo, a ride as he complained his own car smelled of mildew. However, Ben drives Leo to school and discovers Leo is in love with a fellow student, Lindsey. Leo is chatting with Lindsey when her ex-boyfriend, Sean, gives them threatening looks.