|First Appearance||The Vault of the Traveler (determinant)|
|Series lifespan||The Vault of the Traveler to present (determinant)|
Claptrap doesn't appear in Tales from the Borderlands until the final episode, The Vault of the Traveler, if he's hired to be a member of one of the Vault Hunters to combat The Traveler and gain access to the Vault.
To hire Claptrap to be a member of the Vault Team, money has to spent in little to no quantities as possible in the game or having kept Felix alive. If Felix is alive, then he'll reveal the ruse of his supposed betrayal to Fiona, and leave her 9 million dollars, which is enough to hire Claptrap.