'Mary had a little lamb: What really happened' is a fun frolick through a nursery rhyme mash-up, with Mary, Lamb (very imaginatively named), Bo Peep (who really should invest in proper fencing at her property), and the little old lady who swallowed a fly... and lots more animals in town (so it is rumoured)! There's also a detective, hired by the mayor (worried about the town's reputation) and Old Mac, who really does want to write a song about the whole saga.