![](https://image.tmdb.org/t/p/original/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![](https://image.tmdb.org/t/p/w342/hQE9o04GSuk0y3fxAaJLUSa4Lcp.jpg)
Swamp Thing
Lassie tries to warn the unsuspecting Timmy and Billie that an alligator is loose in the swamp, where they've gone to look for the local legend, ""Ol' Joe,"" the Swamp Thing.
![](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
Other episodes for this season
![The Great Escape](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Lassie Comes Home](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Swamp Thing](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Raft](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Horse Healer](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Biker Boys](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Where's Timmy?](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Lassie Is Missing](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Big Smoke](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Open Season](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Feud](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![A Day in the Life](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Cats Out of the Bag](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![On the Case](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Sweet Science](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Poster Pup](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Rush to Judgment](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Fathers and Sons](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![That Boy and Girl Thing](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Friends of Mr. Cairo](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Bone of Contention](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Great Emu Hunt](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Not on the Map](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Dog Gone It](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![Collie Confusion](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
![The Lassie Files](https://image.tmdb.org/t/p/w300/cd2GobBm5QNKRWdjmkazSnutfr6.jpg)
Lassie tries to warn the unsuspecting Timmy and Billie that an alligator is loose in the swamp, where they've gone to look for the local legend, ""Ol' Joe,"" the Swamp Thing.