>> until lantze is find dead or alive, i've got to find him. >> reporter: frank wood rushed his family into their storm shelter as a twister struck. >> we got to get in now. come on, bud. it's coming right over us. we're right in its path. >> one beloved member of the wood family, roxy, the dog, didn't make it into the shelter. we'll find out what happened to her, and believe me, you'll want to hear that. all these stories in detail tonight, and witness the courage of people beset by both catastrophe and tragedy. but we start at the beginning. it's 5:40 on sunday evening and a monster rakes across joplin, missouri. >> strong tornado! >> listen to it! >> as the twister roars toward this convenience store -- >> no, they haven't yet.