24. Felicity, Season 4 (The WB; October 10, 2001 - May 22, 2002)
Felicity features one of the craziest plot twists in teen drama history. While time travel is something that we'd expect from a sci-fi show, and is even downright run-of-the-mill on a program like Dr. Who, TV properties previously steeped in realism probably shouldn't employ it as a plot device.
Even worse, Felicity (Keri Russell) doesn't even do anything cool once she has the time travelling powers. She predictably uses her newfound abilities to engineer a relationship with a boy (after all, this was the WB) only to cheat on said boy one measly episode later. What an unfortuante ending for a show that saw its early seasons showered with award nominations for its acting, cinematography, and editing.