"A Grand Adventure": Archie's grandpa has a big dilemma: he's been a member of the Senior Nature Scouts for years, but until he gets a photo of himself with a wild animal, he'll only be a third class Scout! He takes the gang on a trip to the zoo to make his dreams come true - but don't forget, Archie's genes had to come from somewhere! It's animal antics as Archie's goofy grandpa puts the "oo!" back in zoo!