Losing an overtime claim could cost you hundreds or even thousands. Losing an overtime class action could cost you millions. Starting in 2007, overtime class action lawsuits sprang up all across Canada. Last June, it looked like the monster had been put back in the cage when an Ontario court dismissed the $600 million overtime class action lawsuit by employees of CIBC. But a new case involving Scotiabank gives employers fresh grounds for concern. Here’s a look at the threat, how to assess your vulnerability and how to protect yourself.