It's hard to believe Danedream, number 38 on our countdown, won the Arc back in 2011, but time flies when you're having fun. She arrived at Longchamp with a brace of Group 1s under her belt, yet wasn't expected to beat the likes of Sarafina, So You Think or reigning champion Workforce, and was duly sent off at 20-1.
Bookmakers would never make that mistake again - she was favourite for four of her five final races, although not in the 2012 King George VI and Queen Elizabeth Stakes, which she won by a nose over Nathaniel.
However, dreams of back-to-back Arc wins were cut short when her Cologne training centre was put on lockdown due to an EIA outbreak. Fans were robbed of their last chance to see her, but can look forward to seeing her progeny on track soon - perhaps the three-year-old Frankel filly Nothing But Dreams.