They tried it with a spin-off of "How I Met Your Mother," they're currently trying it with an Australian version of "The Office," and you can bet they'll keep trying to recapture lightning in a bottle with "The Big Bang Theory" -- either until morale improves or the heat death of the universe puts us all out of our misery,

The Big Bang Theory 's new spin-off series has lined up three original show cast members to return. The classic comedy has already spawned prequel Young Sheldon and its own offshoot Georgie & Mandy's First Marriage – which is due to premiere next week.

The Big Bang Theory may have come to an end, but its universe continues to be developed through new spin-offs. The cast of the third includes some familiar faces.