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

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