As T.K. (Ronen Rubinstein) celebrates a year of sobriety, Owen and Gwyn (Rob Lowe, guest star Lisa Edelstein) may not make it to the end of the week as a couple in "Bad Call," the winter finale. Meanwhile, Carlos (Rafael Silva) finds himself working a case with his Texas Ranger father (guest star Benito Martinez). On the job, the 126 team responds to calls involving a bank robbery, an apartment fire and a pregnant woman lost in a parking garage.