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Muscle and Flex are one-time villains from Teen Titans Go!, only appearing in the episode "Birds". They are a pair of mutated mockingbirds, who often antagonize the Teen Titans.
Muscle was voiced by Scott Menville and Flex by Tom Kenny.
Biography[]
The chimney to the Titans Tower was clogged and Robin had to clean it out. He spotter a pair of mocking birds, Flex and Muscle who had built a nest in there. As one would expect the two mockingbirds started mocking him. Robin threw an exploding can of birdy-cide poison in there, forcing them to evacuate. The birdy-cide did more than just scare them off. The chemicals mutated the birds and turned them into two giant mutated mockingbirds.
They had become into big muscular birds who could speak English and live among the humans, Muscle became orange and Flex blue. The two birds became friends with the Titans, as they showed off their big muscles and became their friend. However, when they spotted Robin, the did not take too kindly to him as he was the one who kicked them out of their chimney. Although Robin strongly opposed to seeing those bird anymore, the other Titans wanted to keep them around.
Muscle and Flex partied with the Teen Titans in the Titans Tower, but Robin kept spoiling their fun, so the mockingbirds and the Titans unanimously agreed to kick Robin out.
It wasn't long at all before Flex and Muscle started to get on the last nerves of the other Titans by throwing huge, destructive bird parties and making huge messes that they refused to clean up. Muscle and Flex beat up Cyborg for eating an egg sandwich.
The Titans were alerted to another chimney clogging and the mockingbirds forced the Titans to sweep the chimneys. The Titans saw Robin, sitting in the chimney in a nest, as this is where he moved to after being kicked out. The Teen Titans allowed Robin back onto the team and they all agreed to take down the mockingbirds.
The Teen Titans broke into the Titans Tower again and got into a huge fight with the mockingbirds. Unfortunately, the mockingbirds were too strong for the Titans to defeat in battle, so Robin threw an exploding can of birdy-cide at them, thinking it would kill them. However, it only mutated them even more, turning them into super genius future birds, who were evolved way past the forms of their former selves.
Flex and Muscle said that they had now been enlightened with the massive amount of intelligence they gained and that they had now gained inner peace. They had decided to stop being evil and peacefully surrender to the Titans in battle. Plus, their gain in mental mass caused them to lose a lot on muscle mass. Instead of forgiving them, however, Robin attacked them brutally, knowing that they were too weak to fight back. The two mockingbirds freaked out and cowered in fear as they fled the Titans Tower for good. Robin curses them as they left and claimed victory against the mockingbirds.
