Supergirl Episode 18 "World's Finest" - SNS Review

We're reviewing the 18th episode of the 1st season of Supergirl, "World's Finest". While having to deal with two supervillains, Livewire and Silver Banshee, Supergirl gets help from an unexpected Flash who crosses over dimensions into her world. The series features Melissa Benoist in the title role. Supergirl is a costumed superheroine who is Superman's cousin and one of the last surviving Kryptonians from the planet Krypton.