Marcus is a recuring villain in the Disney XD series Lab Rats. Although he orginally appears as friendly and harmless, he is revealed to actually be a ruthless bully, who is intent on kidnapping Adam, Bree and Chase and works for a mysterious figure who wants them.
History
Upon being introduced, he strikes a friendship with Chase and Adam, and forms a band with them. However, he turns on Leo and sabotages there instruments and blames Leo. Leo tries to reveal who he really is, but Marcus confessess and makes a lot of excuses, he pretends to apologize but really threatens Leo.
He later manages to trick them into inviting him to there home, where he breaks into the Lab and places a secret camera. It is revealed at the end he is really evil and is secretly working for some mysterious figure.
A few days later he lures Adam, Bree, and Chase out to get frozen yogurt. He tries to trick them into going home with him, however Leo tries to stop him. As such Marcus hacks Donalds robot car, so it would drive nonstop into the ocean, then tricks Leo into getting in, almost killing him. He later comes visit under the pretence of visiting to see if he's okay, but accidentally lets it slip it was him who did it. Leo tries to tell Donald, but Marcus reveals he's bionic as well, and threatens Leo, telling him if Leo lets anyone know, he will expose there secrets and thus ruin his family.
A while later, Marcus again tries to invite them over, but Leo sends them off, however Marcus telekintetically closed the doors to the building trapping Leo, and reminded him of what would happen if he revealed his secret. He then telekinetically tossed a trash can at Leo, and told him to be weary as he didn't miss twice. Leo later followed Marcus back to his home, where he found a secret lair under his house. Marcus caught him, and used a giant robot to catch him. But Leo played on his arrogance, and managed to outsmart him and grab the remote. However as he did not know how it worked, the Robot went haywire. Marcus managed to destroy it with his lazer vision, but Leo escaped. Marcus covered up all the evidence, so the others didn't belive Leo (except Donald, who seemed somewhat suspicious) however the mysterious figure (who was revealed to Marcus's father) angrily dressed him down, telling him he had let them get to close, and would now be handling things personally.
Marcus returns, along with his father who is revealed to be Douglas Davenport, Donald's younger brother. Together they kidnap Donald, as part of a plan to lure Adam, Bree, and Chase to them. Marcus makes the call to taunt them and let them know they have his father. Meeting together outside his house, they enter a brief battle, where Marcus proves he's more powerful than them. However Chase apparantly manages to suprise him with one of his new abilities and knocks him down. However Marcus then gets up, revealing it was all part of the plan, he then secures the exits and traps them in. Marcus then goes to recharge, following Douglas trapping them all. Douglas also reveals that Marcus is an android, and thus he needs Adam, Bree and Chase, because he will burn out soon (but also warns them not to tell him as he doesn't know). However upon Leo arriving, Douglas awakes Marcus, as he wants to personally kill Leo. Leo at first confronts him with some of Donalds weapons, but Marcus telekinetically throws the one he was holding, and destroys the others. He then blasts Leo with an electric attack and leaves him to die (Leo survived though as he was wearing one of Donalds protective shirts.) The kids manage to break free, and while Donald and Douglas fight over the remote that he can use to control Adam, Bree and Chase. They take on Marcus. However Marcus is still more powerful, he defeats Adam and throws Chase on to the platform, before revealing a giant meat grinder underneath planning to drop Chase in it. Bree takes him on and temporarily manages to fight him before being defeated, Marcus kicks Chase into the grinder, but Adam shuts it off before he can, and thus Chase simply falls to the ground. Realizing the plan isn't working they try to all take Marcus on at once, however Marcus lets out a powerful electric attack knocking them all down. They are distracted by Leo bursting in with Donarlds robot suit, however Marcus quickly defeats him. Revealing a series of sinister knives he plans to cut Leo openn, stopping him once and for all. However in blind rage Adam unlocks a hidden ability, releasing a great blast of energy the causes the lab to collapse. Marcus tries on last time to stop them, but is crushed under the celling, his robotic hand emerges rom the rubble, before sparking and stopping.
Personallity
Marcus initially appears kind, harmless and friendly. However he shows he is really a dark character, a ruthless, manipulative liar, who will not let anything get in the way of his plans, and will stop at nothing to complete his goals. He proves to be even worse, being openly sadistic and more than willing to murder those who get in his way, even children. However he is able to create a belivible facade as a good person, he only shows his true personallity to Leo, as no one believes Leo. Leo is the only when who can see his true self, this is because Leo disliked him before he revealed he was evil. Marcus seems to have a complicated relationship with his father, although normally willing to argue with him, when he gets angered Marcus clearly fears him.
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