It's Sonic Saturday which means it's about to get all wibbly-wobbly and timey-wimey up in here and we think that's fantastic. So grab your fez, your sonic sunglasses and "allons-y"  Ethan and Ian are here to bring you "Who Do You Think You Are"; a retrospective look at Doctor Who's best moments in preparation for Jodie Whittaker's departure and inevitable successor in Autumn 2022. This week Ethan and Ian bring in the new year by giving their final allons-y to David Tennant as they cover the Tenth Doctor’s regeneration in “The End of Time Part 1 & 2” as they discuss Tennant and RTD’s tenure on the show, praise the talent of Bernard Cribbins and contemplate what makes this episode the epic it is regaled as.