April 12, 2011 5:42 pm “Welcome Back, Kotter” Cast Belts Out Theme Song John Travolta and other members of the ’70s sitcom also talk about their best memories from the show’s run. US & World Videos 3:15 NSC reviewing cease-fire proposal: ‘I don't know that it gets any more sensitive than it is right now' 2:23 Climate change is moving Tornado Alley and driving more tornado outbreaks 1:41 Trump fined additional $1,000 for gag order violation and threatened with jail 0:53 Man attempts to shoot pastor during church service 3:28 Boy, 4, found dead after being swept away by floodwaters in North Texas