Knowing his people face a bleak future on the reservations, Chief Sitting Bull prays to the Great Spirit for a different path. The Great Spirit's answer is to send General George Custer and the Seventh Cavalry 40 years into the past, where they join Davy Crockett to defend the Alamo against Mexican forces under the command of General Antonio López de Santa Anna. Custer believes defending the Alamo may be his greatest moment of glory, but he soon learns that this war for Texas independence will prove far more complicated.