Thrilled but kinda baffled by Marvel's mind-bending new TV series Legion? You're not alone...

Jean Smart, who plays unorthodox therapist Melanie Bird, told Digital Spy that she and her castmates weren't always 100% sure what was supposed to be happening.

"We would sort of compare notes. 'Did you read the new script? Did you get it? Did you understand?' - and we just decided to give ourselves over to that, let it carry us along like a roller coaster," she revealed.

Fox

Legion stars Dan Stevens as David Haller, a diagnosed schizophrenic who discovers he is in fact a powerful mutant.

You're not always sure what's real and what's just happening in David's mind, but Smart told us that she had complete faith in showrunner Noah Hawley.

"The thing is, even if you don't completely understand it, you know that it comes from an absolutely crystal clear vision on his part," she explained. "You know that it's all going to come together in some fantastic way, so you're willing to just go with it and trust."

That absolute trust has been a part of Smart's Legion journey from the off - the Emmy-winning actress accepted a part on the show without reading a script, or even knowing that the David character originated in Marvel's X-Men comics.

FX

"Noah pretty much told me nothing!" she laughed. "Seriously, he said, 'I'm doing this new show and I want to talk to you about it' and that was all I needed to hear. I signed on the dotted line. Complete act of faith!"

Smart has a warning for fans, too: don't expect Legion to get any less crazy as it goes on. The show keeps twisting and turning right till the very end...

"You won't see the end coming!" she promised. "There's a very interesting twist in literally the last seconds of episode eight."

Legion continues tonight (Thursday, March 9) at 9pm on FOX UK.

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