The Voice The top 10 singers perform, as does coach Adam Levine’s band Maroon 5. 8 p.m. NBC
Supergirl This series starring Melissa Benoist as Superman’s cousin kicks off a four-night crossover event with the CW’s other superhero shows that continues on “The Flash” on Tuesday and “Arrow” on Wednesday before concluding Thursday on “DC’s Legends of Tomorrow.” 8 p.m. KTLA
Explorer Former CIA director James Woosley and “60 Minutes” correspondent Lara Logan are featured in this new installment. 10 p.m. National Geographic...