#1 Michu
Michu, who was signed by Swansea from Rayo Vallecano in the summer of 2012 was heralded as the best value for money signing of the season.
The Spaniard became the talisman for Swansea's success story that season, as he ended the campaign with 22 goals to his name and 18 in the Premier League. He also led the Welsh side to a historic first League Cup title. His staggering performances even earned him a Spanish cap.
Little did anyone know that it would end up being his only cap for the national team and the start of a steep downward slide. He could hardly even find the net in the next few seasons and will go down to be remembered as probably the best one-season wonders ever.
In 2017, he finally announced retirement from football at the age of 31.