Zoo, a 2015 sci-fi show loosely based on the eponymous novel by James Patterson, got cancelled after three seasons, presumably due to low audience.
Season 2 picked up right where season 1 left off, so I suppose the same diptych pattern was intended for seasons 3 and 4, as one does not simply end a series
by remote-crashing a plane onto the one wall which was keeping monstruous hybrids from invading the United States, thus opening an Air Force One-sized breach in it, based on the sole premise that the season's villain would indeed return a baby back.
For instance, when Revolution got cancelled, the crew patched up a comic which tied up loose ends from season 2. I did not find such a thing for Zoo1, but I thought maybe the showrunners later revealed what they had in mind, in an interview perhaps? My Googling doesn't bring anything up so far, but at least one piece of season 4 material was strongly implied by
the IADG agent's dog coming back to life. I want zombie hybrids!
Surely the people who wrote the incredible amount of absurdness2 the third season had to offer, thought of yet even more goofy madness for the next seasons?
1 There's a graphic novel for Zoo but it's related to the novel, not the show (which doesn't have much to do with the book anyways).
2 Don't get me wrong, I absolutely loved the part where the team tucked the hybrid-decoy into a sports car in which they didn't know the bad guy was hiding, and then threw it into an erupting volcano, and then absolutely needed the same bad guy to confess whatever crime, and realized what they had done by reviewing CCTV footage. Guilty pleasure.