I picked up the Time Tunnel volume 1 DVD set a couple of months ago. It covers the first 15 episodes from the series that aired on ABC in the 1960's. Volume 2 came out sometime this month and I only picked it up this afternoon. It contained the rest of the episodes plus two bonus features. One was a time travel themed TV movie that was done in the late 1970's that was aired and the second is an unaired pilot done in 2002 that was a remake of the series.