Bannister家來了一只新寵物，Zeus原先是警察特種部隊的一只英雄犬，然而在Bannister一家看來，做一只牢靠的看門狗它似乎并不夠格。圣誕節前夜，Bannister一家出門后，兩名夜盜闖進了屋子。Zeus大顯身手的時候來了。（文：life_is_good@YDY）                                                                    　　The Bannister family's new addition, Zeus (voiced by Mario Lopez), a former K-9 police hero, appears to be less than the dependable guard dog the family needs. However, when two burglars (led by Dean Cain) set out to break into the Bannister's home while they're away for Christmas Eve, Zeus seizes the chance to be a hero, proving every dog - even this one - has his day.