Mammoth is a comedy show about the life of PE teacher Tony Mammoth. Mammoth is a man literally out of time. In 1979 he was a happy-go-lucky PE teacher, leading a school skiing trip to the French Alps. Life was good. Right up until an avalanche decided to ruin his day by sweeping him away to what was surely his death: a death which would break the hearts of all the kids that he taught, almost all of his colleagues and several mothers, and devastate his best friend and wingman Roger Buck.

Except, of course, Mammoth didn't die. He was miraculously found and brought back to life 42 years later. A perfectly preserved man in his forties. Just one born 86 years ago. For a time, he was a global phenomenon. The world was his oyster. But Mammoth has never really liked oysters; he's more of a pub lunch and a pint sort of bloke.

He was given the one thing that everyone at some point wishes they were given - a second chance at life. An opportunity to right wrongs.
But the simple fact is that Mammoth was pretty sure that he absolutely nailed life the first time around, so all he really wanted was his old life back. The same job. The same car. The same friends. Okay, it was bound to feel a little strange at first, but Mammoth had always believed in just getting on with things. And anyway, things couldn't have changed that much since 1979…

Reeling from some recent news that drops a bombshell on his life, Tony Mammoth tries to make up for lost time. But despite his best efforts, things don't go to plan, and he and Theo end up in a fight with a stranger. Meanwhile, his boss, Lucy, has to fight off the local oddballs looking to donate to help her fertility treatment.