Gentle Ben

As Tom and Mark are watching a mother bear play with its cub the mother gets shot by a swamp hunter. Tom issues as citation to the hunter and takes the cub. Ben appears to be jealous of the cub and when the hunter's boy steals the cub Mark assumes Ben chased it off. They discover that the boy stole the cub because living in the swamp he had no friends or pets. In an on the spot judgement, Tom tells the boy that the terms of his probation are to take good care of the cub, and the boy's father goes along with it.

Ben and Mark stumble upon fish poachers and their illegal smokehouse. The men threaten to kill Ben if Mark tells his father. Later Ben wanders off and Mark follows him onto the poachers' boat; they hide but the boat takes off when they hear Tom's airboat approaching. When they start shooting at Tom, Mark and Ben come to his rescue and the poachers are arrested.

Mark befriends shoeless Jenny Maddox at school. However, when Tom drops her off at her father's dock in the airboat, he discovers that Jenny's father is the alligator poacher he has been looking for. Before he goes back to arrest him, Jenny's father saves Mark from an alligator. Tom thanks him for saving Mark but still has to run him in, although he offers to help him in any way he can.

Mark gets Tom to put a radio transmitter on Ben so he can hear what he's doing when he's away. After Ben wanders off a plane carrying exotic animals crashes in the bush. Ben runs across the plane and when Mark hears the moans of the co-pilot, he figures out where he is and goes to help him. Finding the plane and the injured pilot and co-pilot, Mark calls in the location with Ben's radio. One of the animals is a tiger, whose cage has broken open- Ben protects Mark and the co-pilot. Tom and Ellen then arrive in the jeep and tranquilize the tiger.

Mark is mocked at school and on the school boat when he is the only child in his class that didn't bring in an Indian artifact for show and tell. He decides to go to the private island of Willie Sam Gopher to find his Seminole artifact. Mark befriends Willie's son Jimmie Boy, who wants to go to school so he and Mark sneak off the island. The next day Mark introduces Jimmie Boy as his 'artifact'. Willie comes into the classroom and grabs Mark but is scared off by Ben. Ultimately Willie agrees to allow Jimmie Boy to attend the school.

Ben gets restless when wild bears come near the Wedloe home during mating season. Tom explains to Mark Ben's natural instincts and Mark agrees Ben should be allowed to wander off to have a family. Missing Ben has left Mark sick and unable to eat but he returns to normal when Ben returns.

Developer Philip Garrett wants to clear cut and burn the brush to build a housing development on 60 acres of land adjacent to the game reserve. Concerned about all the animals that will die in the fire, Mark and Boomhauer hatch a scheme to get Mr. Garrett to the woods to see the animals and hopefully decide not to raze the land. They 'borrow' Garrett's wife's dog Hollyhock and tell him the dog liked it there when Mark walked him there and probably returned. But the dog escapes from Boomhauer's buggy and when they find it it is being pursued by wild bear Gertrude, protecting her three cubs (Eeny, Meeny, and Miney). Tom rescues Hollyhock and Mr. Garrett decides to leave most of the land as it is and just use a small area for cattle.

Professor Hugo brings his performing bear Victor to the Wedloe home. He has bought a bungalow in a retirement community and wants to release Victor into the wild. Hugo is unable to adapt to the wild, loses a lot of weight and makes enemies with the native wildlife. Tom and Ellen visit Hugo at his home and discover that he is lonely without Victor. The two are reunited and Victor is placed in a zoo and Hugo is made his zookeeper.

Mark leads some thieves to Boomhauer's honey farm and overhears them saying they will kill the game warden if he catches on. They notice Mark has heard them and tell him that if he says anything to his father they will shoot Tom. When the hives get damaged Ben is blamed but Mark doesn't want to say anything so that he can protect his father. When it comes down to Ben being punished, Mark tells his father what is going on. After a fight and Ben's intervention the thieves are apprehended.

A little girl gets lost in the Everglades. There is also an injured wildcat roaming the same area. Against his father's orders, Mark and Ben join in the search. Just as the girl is cornered by the wildcat, Mark and Ben find her and Ben scares the wildcat off. The main search party hears the commotion and the girl is reunited with her father.