12 Unanswered Questions From Famous TV Shows That Are Still Killing Us

9. What Happened To Peter's Girlfriend Caitlin? - Heroes

Heroes remains one of the most frustratingly messy TV shows of the 21st century.

After a tremendous first season, things quickly went down the tubes thanks to the 2007-2008 WGA Writers Strike, leaving (among other things) the fate of Peter Petrelli's (Milo Ventimiglia) girlfriend Caitlin (Katie Carr) up in the air.

Peter and Caitlin travel to a future post-apocalyptic New York City, but when Peter is thrown back to the present, Caitlin isn't transported with him, leaving her in the virus-ravaged wasteland in a plot-line that was never returned to.

Peter did manage to prevent the future catastrophe, so fans were left to assume that Caitlin was most likely wiped from existence, something Peter seemed oddly unfussed about given his lack of any attempt to rescue her. Nice.

The show's creator Tim Kring has since stated that Peter was intended to mount a rescue attempt in the second half of the season, but with the strike cutting the episode order down from 24 to just 11, it was ultimately nixed.

By the time season three started production, Kring felt it was too late to return to the plot and better to simply abandon it.