Hannibal Heyes and Kid Curry are members of the Devil's Hole Gang, but it is the 1880s and they are finding that technology is making it very difficult to be a successful robber of banks and trains.
When Sheriff Lom Trevors finds that the Governor is happy to extend amnesty to Heyes and Curry, the boys jump at the chance. However, there is a catch - the amnesty must remain a secret for twelve months, and the boys must prove that they have earned it before it can be granted to them.
Thus - Mr. Joshua Smith and Mr. Thaddeus Jones are born.
Two powerful men have a long running feud concerning the ownership of a Roman bust of Julius Caesar and a strip of land.
Heyes and Curry are press-ganged into stealing the bust of Julius Caesar by one of the men, but then find themselves on the horns of a dilemma when they find that the other man has a moral point of view also.
Heyes and Curry find employment in the gambling saloon at Wickenburg, but then find that the widow who is employing them seems to want to get rid of them despite the fact that they are doing a very good job.
Heyes suspects that somebody else is behind her sudden change of mind.
Heyes and Curry unwittingly - and unlawfully - gain seats on a train which is full of Bannerman detectives who are out to catch the Devil's Hole Gang for once and for all.
This episode introduces Detective Harry Briscoe, a likeable antagonist, who appeared in a couple of episodes of the series.
The Kid is commissioned to deliver $50,000 in bank notes to a town some distance away. There is some pursuit involved, so Heyes acts as a decoy.
The Kid finds himself riding the trains, and it is here that he meets Annabelle, a runaway girl who is pretending to be much more worldly than she actually is.
Grace Turner double crosses the Kid when he is in Mexico on business and gets the $10,000 reward for his capture.
However, she regrets her action as she finds that she has fallen in love with the Kid and later breaks him out of prison. This has the unfortunate effect of making it look as though Heyes and Curry were involved in collecting their own reward money.
Heyes sets up an elaborate 'sting' with Soapy Saunders called The Big Store to get the money back from Grace and thus to clear his and the Kid's names.
Clara Phillips is a woman with a mission - she wants to visit the Devil's Hole Gang hideout where she has reason to believe that her errant husband is hiding. But can this really be true?
Heyes has his doubts, but he takes her there, neverthelesss.
August Binford is a crooked Bank Manager who robs his own bank and murders his assistant. The description he gives to the sheriff matches Heyes and the Kid's wanted posters, so now they find that there is a charge of murder against their names.
Enlisting the aid of Soapy Saunders once again, Heyes and the Kid embark on a complex fraud which involves salting a diamond mine, and which relies heavily on the greed of Bank Managers.
A stationmaster takes Heyes and the Kid prisoner, but is then forced to fight a gang of outlaws who are also after the twenty thousand dollar reward money on Heyes' and the Kid's heads.
Heyes is hired as a guide by two Englishmen who are searching for a tribe of giant redheaded Indians rumored to have lived in the Devil's Hole area.
While Heyes dodges danger in the Devil's Hole area, the Kid drives a wagon load of dynamite across some very rough countryside indeed.
Heyes and the Kid are on a stagecoach when it is robbed by a gang. A young lady on the stage is extremely anxious to retrieve a letter which was stolen in the robbery so Heyes and the Kid offer to get it for her.
The letter turns out to be a treasure map which leads Heyes and the Kid to some real buried treasure.
Heyes and the Kid become involved in a poker game in which all of the participants end up being murdered, one by one.
After Heyes is shot, it is up to the Kid to find out who is behind the murders.
Heyes and the Kid tread a fine line in diplomacy whilst herding cattle in Mexico as a cover for other activities which involve an aggressive Mexican bandit and a saloon owner.
Heyes and the Kid are travelling on a train when they get involved in a poker game with Harlingen, a railroad magnate. Unfortunately Heyes' bag gets mixed up with Harlingen's secretary's bag which is identical.
When they discover the mistake they also find a fortune in jewels hidden in a Bible. With good intentions they take the jewels back to Harlingen, who is extremely ungrateful when he finds that they are copies.
Riding into Browntown, Heyes and the Kid hear their names being called from the local jail. It is Charlie O'Rourke, sentenced to hang the next morning and anxious to let them know where he has buried a hoard of stolen gold.
Heyes and the Kid are not interested as it might affect their amnesty, but the local saloon girl is extremely interested, spending Charlie's last hours with him, singing and chatting. Another interested party is Harry Briscoe whom Heyes and the Kid had met on a train carrying Bannerman detectives, but who appears to have since become a little bit corrupt.
A young man claiming to be Kid Curry is going to be hanged for murder.
Curry must clear his name if he wishes to acquire an amnesty.
Harry Wagoner is a small time criminal who decides to use Heyes' expertise at safe breaking in order to rob a bank.
Harry enlists the aid of two women who manage to abduct both outlaws. Heyes is forced to help Harry blow a safe while Curry endures the attentions of the erratic Lorraine.
Heyes and Curry are press-ganged into being deputies by the local sheriff and are told to escort a gang of outlaws to Junction City.
Knowing that the sheriff at Junction City is ignorant of their real identities, Heyes and Curry are happy to go along with the plan, but events do not go as planned.
Heyes and Curry work with a man named Danny Bilson on a goldmine owned by an old man called Seth, the profits to be shared equally between the four men.
When Danny Bilson steals all the gold and leaves Heyes, Curry and Seth with no water and no transport in the middle of the desert, the lives of the three men are at stake.
Heyes and Curry are being pursued by a posse of lawmen which contains an apache with remarkable tracking abilities.
They end up hiding out with a temporarily laid up farmer, his wife and two tomboy daughters. While working around the ranch every day, a close friendship forms between the boys and the family.
Then one day the posse turns up.
Heyes and Curry have been hired by a man who wants Heyes to use his powers of persuasion to get his runaway wife to return to him.
Eventually Heyes succeeds, but when the man is murdered suspicion falls in the wrong place.
Heyes and Curry are hired to retrieve some stolen gold which is buried on land belonging to hostile indians.
Heyes and Curry meet an old prospector who, thinking that he hasn't long to live, gives them a map to a gold mine. The boys decide to mine it in company with some other men from the town.
Things go well for a while, with each man gathering his gold dust, and sizeable fortunes build up. However, one day Heyes and Curry discover that their precious cache of gold dust has been stolen, presumably by one of the men who is working on the site.
Meanwhile the old prospector has turned up - he hadn't been dying, but was simply weighed down by all that gold dust and was suffering from a hernia. He joins the rest of the boys working the mine, and although Heyes and Curry are extremely annoyed at the loss of their gold, things carry on until one day winter arrives with a rush and the men discover that they are snowed in for the winter in a cabin high up in the mountains.
The only way for Heyes and Curry to recoup their missing gold is to win it back at cards. They suspect that the thief is a dodgy Doctor of Medicine calling himself Dr. Chauncy Beauregard. When Heyes and Curry introduce a new card game called Montana Red Dog the Doctor suddenly finds himself on a losing streak.
Heyes and the Kid run into Bannerman detective Harry Briscoe who tells them that a nun whom they had recently helped stole $30,000 from a bank while employed there as a teller.
The boys run into their old friend Clementine who inveigles them into taking part in a swindle worth $50,000.
Heyes and Curry are on their way by stagecoach to see Sheriff Lom Trevors about the state of their amnesty. The stagecoach pulls into Diablo Station so that the horses can be rested, and the passengers can get cups of coffee.
Into this scenario walk four gunmen. They tie up all the passengers, including Heyes and Curry, and then settle down to wait. Curry asks them what they're waiting for, and the leader of the outlaws tells them that they are waiting for Sheriff Lom Trevors to come. According to Chuck, the head of the outlaws, his brother had been killed by Trevors some time earlier, and he is burning with revenge and wishes to kill Trevors.
Heyes and Curry are extremely worried. Not only is Sheriff Lom Trevors a good friend, but the success of their amnesty depends on him. They must find a way of letting him know that he will be walking into an ambush. But how?
Then Heyes has one of his ideas.
Heyes and the Kid are captured by a black bounty hunter who is determined to claim the $20,000 reward on their heads.
Although they save his life a couple of times during the course of the story, the black bounty hunter will not give up his prize.
When two young men posing as Heyes and Curry get involved in a bank robbery, the real Heyes and Curry hurry to the town where the event happened in order to clear their names.
But they don't realise that they will get involved with the real robber, who is a killer and a womaniser as well as being the son-in-law of the bank's Manager.
Heyes and Curry are approached by McCreedy who now knows their true identities and threatens to tell the sheriff if they don't do what he wants.
McCreedy wants to steal the McCreedy bust from Armendariz and then to sell it so that the fued between the two men will cease once and for all. He enlists Heyes' and Curry's help and Curry runs across a bullying local who insists on having everything his own way.
Heyes and Curry are charged with a new bank robbery after meeting Chester E. Powers, a bank owner. After he saves them from a broker they conned, Winford Fletcher, the two retired outlaws agree to meet with Powers for what they think is a legitimate job. It turns out that Powers framed them for robbing his own bank, endangering their amnesty.
A poor prospector with his wife and young son captures Heyes and Curry and turns them into the sheriff at Hadleyburg.
However, when the prospector and his family start having twinges of conscience things brighten considerably for Heyes and Curry.
Hayes believes a plan poker game which he lost money in was rigged, so he plans to retrieve it somehow.
Mia Bronson is a swindler who has located her next victim, a man named George Austin.