Fringe will return for a fourth season. That's the fantastic news.

But it won't return with a new episode until April 15. That's the sad news.

When Fringe does come back, it will do so with "Lysergic Acid Diethylamide," an installment that centers around a major, literal trip. What do we mean? Watch the following preview to find out and then relive the most recent installment via our first-ever Fringe Round Table.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.