The world's been saved from the aliens, and now it's back to business as unusual on "The Flash." There's still Doctor Alchemy (Tom Felton) to worry about -- plus the very creepy speed god Savitar, who seems to want nothing more than to destroy Barry Allen (Grant Gustin).

What about Wally (Keiynan Lonsdale), though? When last we saw Flashpoint's Kid Flash, he was harnessing his speed and asking HR (Tom Cavanagh) to help train him. While there will be plenty to cover in the Dec. 6th midseason finale, there's still room for this wild ride HR and Wally are about to go on. Of course, as you might expect, it's going to be a bumpy one.

RELATE: ‘Invasion!’ conclusion heals Flashpoint wounds — just in time for something worse

"It will not go well. As assumed," executive producer Andrew Kreisberg says with a laugh. "But I think HR, what I love about this version of Wells, and he’s said it himself before but we actually show it rather than just tell it, he is a genius in his own way. He’s not a mathematical genius and he’s not a physics genius the way the other Wells’ were. But he has the capacity to see it in other people. And he has the capacity to see other people’s talent and how to mine it and how to grow it. He sees that in Wally."

According to Kreisberg, the relationship between the two will help cement HR's legacy. Whereas Harrison Wells was important to Barry's growth in Season 1, and as Harry was to Cisco in Season 2, this year it's Wally who gets that chance.

RELATED: The moment The CW became a superhero juggernaut

"Like he says in an upcoming episode, there’s nothing in it for him to help Wally, but he sees that Wally is special -- and that’s where he can shine, in helping other people discover their own value and helping other people develop their own gifts," he explains.

Still, while HR may see the value in others and has an ability to help them find it in themselves, he rarely does so without some kind of chaos following. So chances are that even if this is a good thing for Wally -- and we hope it is, because we need more Kid Flash -- it's bound to seriously ruffle the feathers of the rest of the team.

RELATED: ‘The Flash’ finally reveals a timeline change that isn’t Barry’s fault

Of course, frustrating Team Flash is the thing HR does best.

Posted by:Chris E. Hayner

Chris E. Hayner is equal parts nerd, crazy person and coffee. He watches too much TV, knows more about pro wrestling than you do and remembers every single show from the TGIF lineup. You may have seen him as a pro-shark protester in "Sharknado 3." His eventual memoir will be called "You're Wrong, Here's Why..." TV words to live by: "I'm a firm believer that sometimes it's right to do the wrong thing."