cavemenABC’s “Cavemen.”ABCMany of the worst television shows originate from some highly questionable concepts that make you wonder how they ever got approved.

ABC’s “Cavemen” series in 2007, for instance, was based on characters from a short-lived Geico commercial. And Fox’s 2014 reality show “I Wanna Marry Harry” saw 12 women compete for the chance to marry a Prince Harry look-alike who they thought was the real Prince of Wales.

Both shows were critical disasters, and each lasted only one season — as many of the worst reality shows, dramas, and sitcoms have.

To find out which programs critics have hated the most, we turned to the review aggregator Metacritic for its list of the worst TV shows, which goes back to 1995. The list ranks show seasons by their composite critical reception.

Check out the 50 worst TV shows from least to most objectionable, according to critics: