No Time for Clones S4, E1: Due to an accident with Barney's recently invented time machine, C2 creates an alternate world where Carl is a nerd, Chloe is a cheerleader, and clones don't exist. C2 and nerdy Carl rush to build a time machine of their own
Being a teenager is tough..... try being two! That's the dilemma facing Carl Crashman, a slacker teen who accidentally generates his own clone after venting about his life on his blog. Carl soon discovers that the miracle of cloning is only skin-deep. His ho-hum life suddenly becomes one of a kind (well, two of a kind) as he scrambles to cover up the trail of chaos that his exuberant clone leaves in his wake.