Episode Title:Valley Girls.Episode Description:The Thornberrys are in Uganda's Bwindi Impenetrable Forest to film the rare bird the great crested grebe. While Marianne and Nigel go off to film the girls argue over the use of the tape player. In the ensuing argument Debbie releases the commvee's brake and it takes off downhill. It finally comes to rest on a muddy river bank where it is firmly stuck. The girls will have to work together to free it, with help from some local mountain gorillas.