Could this show get any more exciting?
"In the show, Reactron's history with Superman will already be well-established, and he'll have left Metropolis to get revenge by killing Supes' cousin instead. He'll appear in the third episode, and may become a recurring character."
Which sounds like bad news for Supergirl! In the comics, the character was actually able to essentially deactivate Kryptonian powers (for a short amount of time). It's a great way to raise the stakes. Supergirl and her cousin Superman are usually way more powerful than anyone on Earth, but after a while an attack from a super-powerful alien from space gets kind of predictable.