As far as I can find, The Guinness Book of Records (as of September 2013) states the Japanese show, Ultraman has the most spinoffs at 27.
(sgcafe.com/2013/09/ultraman-wins-guinness-world-record-tv-series-number-spin-offs)
It is not a "full" season. Most TV shows have over 10 weeks while a limited series has less.
The American actress Susan Dey has worked in both film and television. Her two most prominent roles were in the 1986-1992 TV series L.A. Law and the 1970's TV series The Partridge Family.
Top Gear on the BBC, close to 350 million viewers.
Siska - TV series - was created in 1998.
The Garage - TV series - ended in 2007.
Law & Order
Tales from the Crypt
TV Land's Top Ten - 2004 Top 10 TV Spinoffs 1-14 was released on: USA: 7 June 2006
Friends
Yes, There's the spinoffs.
All in the Family 1) The Jeffersons 2) Maude 3)Archie Bunker's Place 4) Gloria5) 704 Hauser Even the spinoffs have spinoffs. Maude 1) Good Times The Jeffersons 1) Checking In
Baywatch
friends
bar codes, pacemakers, TV satellite, Black and Decker cordless products, ski boots, and toothpaste
The Batman television series has already came out on DVD. The Batman series can be found in most store that sell DVD's.
Intervention on A&E
The series was originally created by Marta Kauffman and David Crane. Kevin Bright joined and together they created one of the most successful television series.