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Leo Francis Dooley (played by Tyrel Jackson Williams) is the protagonist of the Disney XD series Lab Rats. He was sent plummeting into a secret underground lab in the basement of the home he shares with his inventor stepfather, Donald Davenport, his mother, Tasha, and Eddy, the "smart house" computer, where he discovers three teen super-humans, who he first thinks make danger, but it turns out they end up being his best friends.
Leo is a normal teenager who finds the bionic trio in his new dad's place. Leo is not popular at school, and he only wishes to be a great inventor like his dad and be finally be known.Leo is the only character in the show to wear long sleeves.
Crush, Chop and Burn"
Despite the episode's title being "Leo's Jam," Leo does not appear very often as a main character.
At the beginning of the episode, Leo tries to ask Danielle to the dance in order to teach Adam and Chase how to ask a girl out to the dance. After his unsuccessful attempt, Bree arrives and begins to moan about the dance. He is not seen again until he, Adam, and Chase escape from Ethan.
He appears again when he and Adam are fighting with toy robots. Chase arrives with a plan to make Danielle like Leo. They devise a plan that they are sure will work. At school, they place a row of lockers on top of Adam to make him appear to be trapped. When Danielle and her friend see Adam under the lockers, Leo announces that he will save Adam. Since Leo cannot lift the lockers on his own, Adam helps him by pushing upwards on the lockers. In doing this, Danielle falls in love with Adam and not with Leo.
When at the lab, the boys try to talk it out, but Leo gets angry and jumps on Adam, screaming. Eventually, Adam reluctantly agrees to let Leo go to the dance with Danielle.
The next day at school, when Leo, Adam, and Chase all meet up with Bree, she believes that she had scared Ethan off, and Leo reminds her about the skid marks she left in the hallway.
Leo is seen again when Chase announces that he is going to the dance with Danielle, Leo jumps onto Chase and begins to scream, like he did to Adam.
Leo and Adam are both mad at Chase for going to the dance with Danielle. When Chase tries to explain what happened, Adam asks Chase if he’s taking Danielle to the dance after all. When Chase says that he is, Adam becomes angry and storms away.
Leo gives up his dreams of having Danielle as his girlfriend, and says that if he can’t have Danielle, then he’s glad Chase can have her. He then asks if Chase knows how to dance, and teaches him the “Refrigerator Dance.”
At the dance, Leo is seen when Bree arrives in high heels. He suggests that she wear a helmet with them because she is stumbling so much.
After this, Leo is not seen until he comes out to dance with his aunt and her book club. His dance causes Danielle to dance with him for the rest of the dance, until he realizes that Adam and Chase’s feelings are hurt.
He leaves Danielle to apologize to Adam and Chase. Together, they promise to never let a girl come between them “At least not until tomorrow,” they add as a girl walks by. They jump up and chase after her.
"Rats on a Train"
He is first seen when Davenport announces to the Lab Rats about their extreme climate training. When he complains that he wants to be "abused by weather." It is then revealed that he receives brain freezes from chewing mint gum, thus proposing that he could have sensitive teeth.
"Exoskeleton vs. Grandma"
Donald Davenport is Leo's stepfather. He created the bionic trio and owns the house that Leo moves into.
Tasha Davenport is Leo's mother.
Rose Dooley is Leo's grandmother.
- Leo says that his middle name is Danger, even though it's really Francis. He says it is pronounced Danger but spelled F-R-A-N-C-I-S.
- He has a crush on Danielle.
- Leo is considered a nerd until he meets Bree, Chase, and Adam.
- Leo's mother mentioned that his teachers think he is strange.
- Leo is not very good at basketball.
- Leo is a good dancer.
- He wants to be like the Lab Rats.
- Leo gets brain freezes just from chewing mint gum, which could possibly mean he has sensitive teeth.
- When Leo looks for his room, he says that he needs a GPS "just to find the bathroom".
- Douglass gives Leo a bionic arm, since it was so injured by Krane and S1 he could not use his normal arm.