These are the lyrics for the Ben 10 theme song. They were written by Andy Sturmer and performed by Moxy.

It started when an alien device did what it did
And snuck it's self upon his wrist with secrets that it hid
Now he's got super powers
He's no ordinary kid
He's Ben 10 (Ben 10)

So if you see him you might be in for a big surprise
He'll turn into an alien before your very eyes
He's slimy, creepy, fast, and shiny
He's every shape and size
He's Ben 10 (Ben 10)

All of his powers he's on the case
Fighting off evil from Earth to space
He'll never stop till he makes them pay
'Cause he's the baddest kid to ever say the day
Ben 10! (Ben 10)