This week Rick Astley sings a classic and his new single, Olly Murs performs and two little producers take over the show much to their mum's surprise.

Double gold medal Olympian Rebecca Adlington plays celebrity Send To All, where Michael sends a text to all of her phone contacts. Michael makes a trainee teacher's dreams of performing in the West End come true when she thinks she is helping at an art gallery, but ends up being the Unexpected Star of the show.

Michael McIntyre has a treat for you this Christmas when his Big Show, filmed in front of a live audience at the Theatre Royal, Drury Lane, gets festive.

There is a merry performance from Michael Ball and Alfie Boe; Aled Jones is joined by a very special guest as he plays Celebrity Send To All; Unexpected Star reaches epic proportions when Michael surprised an entire choir and there are lots of yuletide games and celebrity guest appearances form Nan (Catherine Tate), Kevin the teenager (Harry Enfield) and more.

This is one Christmas extravaganza not to be missed!