Tom Cavanagh weighs in on Eobard’s master plan: "He's been using the wealth of his mental ammunition to plot what happens in the next few episodes."

The Reverse-Flash (Tom Cavanagh) is ready for the end game.

The Flash's final two episodes of the season sees Harrison Wells/Eobard Thawne attempt to carry out a plan 15 years in the making, one he hopes will take him home to hundreds of years into the future. Cavanagh promises that the season-long mystery surrounding his character will be answered in a definitive way.

Part of the plan involves reactivating the particle accelerator (according to CW promos), the same piece of technology that gave Barry (Grant Gustin) his powers in the series premiere. There's a lot at stake. Not only has Eobard kidnapped his ancestor Eddie (Rick Cosnett), he'll also face off against Arrow (Stephen Amell) and Firestorm (Robbie Amell) in Tuesday's episode.

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In a chat with The Hollywood Reporter, Cavanagh talks Reverse-Flash's master plan and what to expect from the finale.

Will we get a definitive answer on Reverse-Flash's master plan in these final two episodes?

Absolutely. We're not looking to shortchange people. People have been aboard the ride and that lug is going down the funnel.

Doesn't Eobard have an interest in keeping Eddie safe, since they are relatives?

They are both Thawnes and we are going to address that, but I also caution people. We can introduce Harrison Wells early on as a foil to Thawne, which we did in episode one. We're not above changing storylines here and there. I wouldn't read too much into the fact that they are both Thawnes.

So it doesn't mean he's a direct descendant?

In the episode we just did, we did talk about the bloodline. And I think it's important to note we share a bloodline. When it comes to the unveiling of the Thawnes, it's significant that I'm a Thawne and he's a Thawne.

We've seen Reverse-Flash low on power. Is that something that comes into play in these last two?

It's one of the biggest story points in terms of the characters. If things were status quo for Reverse-Flash for his speed and for his powers, he wouldn't have a secret vault at STAR Labs where he's interacting with Gideon, formulating a backup plan. He's been stranded here for 15 years. He's been using the wealth of his mental ammunition to plot what happens in the next few episodes. The reason he has to do that, is because he's had to come up to a solution for this occasional lack of juice.

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At the end of last week's episode, he seems very sure of what his next moves are.

It's not without curves or pitfalls as any good superhero show will take you. And in the next episode we have that in spades with the confrontation between Flash, Firestorm and Reverse-Flash.

Reverse-Flash is so powerful. Even with Arrow and Firestorm helping out, is it a fair fight?

Three against one doesn't seem that fair. But he is powerful. Thank God it wasn't a handsome-off. Because they are so damned good-looking, these three guys. I would say it's a good matchup. And you will see.

The Flash airs at 8 p.m. Tuesdays on The CW.