Considering Gotham's relatively grounded tone so far, Viper/Venom aside, introducing the monstrous Killer Croc without feeling too fantastical would be a tricky business. Unlike, say, Basil Karlo, whose story could easily be told without needing to end with him truly becoming the shape-shifting Clayface, Croc's condition is an intrinsic piece of his character's origins and development. An easy way to bring in the character would be if a carnival came to town and, with it, a series of grisly murders and robberies. As Gordon and the GCPD investigate who's behind it all, a young Waylon Jones could make an appearance on the series as an angry, vengeful victim of the earlier stages of his condition, with the series suggesting that it is only bound to get worse and more in line with the hulking creature he is in the comics. Leaving Jones with an ambiguous fate, either through apparent death or an escape into Gotham's sewers, could afford the show with the opportunity to bring him back in later seasons with his condition worsened or simply leave Jones as a one-off character whose existence could continue on throughout the show's run as a running urban legend to tease his future as one of Batman's most dangerous foes.
Writer, film enthusiast, part-time gamer and watcher of (mostly) good television located on the fringe of Los Angeles, who now has his own website at www.highdefgeoff.com!