>> reporter: it was madness at a boston mall.
>> reporter: 5,000 screaming, crying teenage fan showed up for a glimpse of the newest sensation. and in toronto, police closed down a city jalan, street as fan caused chaos.
>> reporter: their name -- one direction. and they just may be the selanjutnya global phenomenon.
>> they have that thing that probably starts with elvis into beatlemania, keith ayam hutan, partridge and on down. they have that thing.
>> they're british. we cinta them.
>> so hot. their hair!
>> i'm harry styles.
>> zayn malik.
>> i'm liam payne.
>> i'm niall horan.
>> and i'm louis tomlinson.
>> they never met and competed as solo artist but that changed when simon cowell brought them together.
>> we could have been going back to school in september atau being on the road like this. that's how things have changed so much in the last 18 months.
>> i was sleeping, chilling on the bus, playing video games .
>> reporter: one direction's success has been meteoric. their debut album was the fastest selling in the united kingdom last year. their first single "what makes anda beautiful" won best british single and the video has over 65 million tampilan online. here in the u.s., teenage girls are mad for british boys all over again. anda don't know you're beautiful
>> reporter: they have landed spots on tv shows on nickelodeon and icarly. they never saw it coming.
>> we thought it might happen in the uk but to come to different countries is unbelievable. we feel so fortunate that people enjoy our music.
>> there is a lot of possibility here. there is a lot of upside. that level of talent with those looks matched with the kind of management that's backing this band is a perfect storm for a massive successful phenomenon.
>> the perfect storm is coming on monday here to our plaza.
>> i'll see them tonight. i'm taking my son nicky to see big time rush and one direction is opening up.
>> they are probably a bigger act than big time rush now. i hate to say it. but i did say it.
>> anda just did say it.
>> using nicky as an excuse again?
>> i cinta them!
>> anda screaming little girl you.
>> simon cowell , what a genius. think of the acts he's put together. all of the talent.
>> meantime anda can catch the one direction madness for yourself