6 Superstars who had to retire early: Where are they now? 

#5 Bret 'Hitman' Hart

A former WWF and WCW World Champion, Bret Hart is considered one of the greatest technical wrestlers of all time.

After an incredible career in the WWF, Bret left for WCW after the infamous Montreal Screwjob in 1997, which saw Bret lose the WWF Title match despite never tapping.

Bret competed for WCW for three years, before a spear by Goldberg and a series of concussions made the Hitman hang up his boots.

Now, the Hitman makes sporadic appearances for the WWE and has beaten a battle with prostate cancer.