Supergirl Barry Allen (Grant Gustin), the CW's "The Flash," brings his title character to CBS to partner temporarily with Kara (Melissa Benoist) to battle enemies Silver Banshee and Livewire (Italia Ricci and Brit Morgan). 8 p.m. CBS
The Voice Miley Cyrus helps vocalists prepare for the knockout rounds. 8 p.m. NBC
Crazy Ex-Girlfriend Josh's (Vincent Rodriguez III) sister (Tess Paras) is getting married and asks Rebecca (Rachel Bloom) to be a bridesmaid. 8 p.m. KTLA
Gotham Gordon (Ben McKenzie) is no longer in protective custody and faces new threats inside the...