Imagine a world where Swedish pop sensations ABBA never really existed... What if we're living in it?

Jenny Ryan (ITV's The Chase) is finally ready to go public with her theory of the Mamma Mia multiverse. She's given this a lot of thought. Arguably too much thought. Who really did write Waterloo? Was Andy Garcia a child soldier? Is ABBA Voyage a collective hallucination? How did that horse get into Meryl Streep's basement? And, crucially, what's Gillian McKeith's role in all of this? A singalong comedy investigation/cry for help.