‘Sonic and the Underboys’ is a childhood project Tilly Robinson made from when she was 6. It is based off the Mario & Sonic game franchise where the plot focuses on Sonic the Hedgehog, Shadow the Hedgehog and Bowser Jr (also known by their band name as ‘The Underboys’) and Princess Peach, Princess Daisy and Amy Rose (who are known by their band name as ‘The Undettes’). This was originally a Mario & Sonic version of the Alvin & the Chipmunks movies because Robinson was obsessed with both of these as a child and yes, it doesn’t make sense it features random Mario & Sonic characters (and one of them doesn’t even happen to be Mario) but like I said, Robinson was only 6 when she came up with this idea!