The actor-turned-documentary presenter will also return to Albert Square in a surprise scene.
This week’s episodes will show Peggy finding out that her cancer has spread, shortly after arriving back in Walford.
Sadly, no more can be done for the former pub landlady, and she prepares to say goodbye to her family, and Albert Square, for the final time.
When news reaches Grant, the thought of losing his mother brings his back to the Square - which also means he’ll come face-to-face with his brother Phil again.
A lot has changed since Grant was last in Walford, back in 2006.
He’ll also be faced with meeting Sharon Rickman and Kathy Beale again. We love Grant, but this ‘EastEnders’, so don’t expect everything to go without a hitch…
Watch ‘EastEnders’ from Monday 9 May to see the Mitchell family reunions begin. Catch up on all the latest soap news and spoilers here.