Big Bang Theory reveals how Young Sheldon appears in the final series

Watch a teaser clip of the hotly anticipated crossover

Jim Parsons and Iain Armitage as Sheldon Cooper through the ages (E4, HF)

The Big Bang Theory and Young Sheldon crossover is finally upon us.

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After months of build-up, fans of the shows will finally see the two worlds collide before Big Bang ends its twelfth and final season and passes on the torch to its spin-off.

The teaser for the crossover episode shows Sheldon (the adult version, played by Jim Parsons) feeling down in the dumps after the Nobel Prize-seeking theory he concocted with Amy was disproven.

In a bid to cheer him up, Amy digs out a video tape from Sheldon’s past that has a message from his younger self (played by Iain Armitage).

As the ten-year-old version of Sheldon perches on the edge of his bed, he says: “Hello Sheldon. If you’re watching this I assume something bad has happened. Something unfortunate and unforeseen. Something that’s making you question everything.”

“I’m so smart!,” older Sheldon grins. Classic.

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Big Bang Theory airs on Thursdays on CBS in the US with the crossover episode expected to air in the UK on Thursday 18th December on E4