|Original broadcast||December 4, 2009|
|Series||Ben 10: Alien Force|
|Written by||Len Wein|
|Directed by||Butch Lukic|
|Previous episode||Ghost Town|
|Next episode||Busy Box|
Trade-Off is the thirty-seventh episode of Ben 10: Alien Force.
Kevin barges into Darkstar's hideout. As they rumble Darkstar offers a partnership where both of them will regain their original appearances. He explains that a mystical artifact called the Dominus Librium has the power to transfer energies in order to balance them thus returning the object to its previous undamaged form. The artifact is located in an dangerous island filled with traps. They go to the island and eventually get the artifact.
Meanwhile, Ben and Gwen try to contact Kevin for a mission. He doesn't answer, so they decide to go on by themselves. After using the artifact, Kevin loses his powers and regains his human appearance as does Darkstar. Darkstar sucker punched Kevin and keeps the artifact as he retreats. Kevin returns home, shocking Ben and Gwen, who sensed his regular skin. He doesn't tell them about his alliance with Darkstar. Later, the trio fight off some Forever Knights, Kevin is told to stay in the car due to his current lack of powers. He comes in and helps them fight anyway.
As he drops the Tennysons home, he asks Gwen if she liked to go out with him. Gwen declines as an image of Darkstar appears instead of Kevin. Due to this, Gwen finds out what he did and goes to fight Darkstar, but Michael uses the Librium and starts absorbing her energy. Kevin and Ben come to help but Darkstar absorbs Ben's energy as well. Since Kevin can't do anything he grabs the Librium which overloads and explodes. Because of this, Kevin was turned back to his previous mutation, with Darkstar also reverting back/ Darkstar vows to get revenge and flees. Gwen tries to apologize to Kevin but he says it's fine, as it was his fault and it wasn't worth Gwen's safety. Then, Kevin, Gwen and Ben go to Mr. Smoothy.
- Darkstar returns and makes an offer to Kevin to return to their original forms.
- Kevin returns to his human form but loses his powers.
- Kevin reverts to his mutated form.
Naming and Translations
|French||Le Marché||The Trade|
|Hungarian||Indítsd a frekvenciát||Start the Frequence|
|Portuguese (Br)||A Troca||The Exchange|
|Spanish (HA)||El Intercambio||The Interchange|
- The background music in the temple when Kevin and Darkstar take the artifact is the same music as in Ben 10 Alien Force: The Rise of Hex.
- The plot of this episode, mainly Kevin's role, is similar to The Thing from the 2005 Fantastic Four film, in which The Thing is assisted by a villain in reverting to normal from a disfigured form, but decides to re-mutate himself in order to save his friends from the same villain.
|Ben 10: Alien Force Episodes|
|Ben 10 Returns: Part 1 • Ben 10 Returns: Part 2 • Everybody Talks About the Weather • Kevin's Big Score • All That Glitters • Max Out • Pier Pressure • What Are Little Girls Made Of? • The Gauntlet • Paradox • Be-Knighted • Plumbers' Helpers • X = Ben + 2|
|Darkstar Rising • Alone Together • Good Copy, Bad Copy • Save the Last Dance • Undercover • Pet Project • Grounded • Voided • Inside Man • Birds of a Feather • Unearthed • War of the Worlds: Part 1 • War of the Worlds: Part 2|
|Vengeance of Vilgax: Part 1 • Vengeance of Vilgax: Part 2 • Inferno • Fool's Gold • Simple • Vreedle, Vreedle • Singlehanded • If All Else Fails • In Charm's Way • Ghost Town • Trade-Off • Busy Box • Con of Rath • Primus • Time Heals • The Secret of Chromastone • Above and Beyond • Vendetta • The Final Battle: Part 1 • The Final Battle: Part 2|
|Ben 10: Alien Swarm|