I forget the name of a Show, I need help!?

Ok, I use to watch a show on Nickelodeon or cartoon network. It was a group of kids and a room that has tubes that shoot the kids to the different world to save the day. Bad things would happen in the real world then they had to be shot off into the other world to take over towers (Tube Standing Towers) and destroy Monsters. I love the show but I forget the name! Help!