The BBC builds anticipation for the return of their sci-fi thriller 'Orphan Black' with their new trailer introducing some of the intense developments they have in store for the third season.

At the end of the second season the Castor clones were revealed and we now get a better shot at what they looks like.

It's hard to tell if the series is running into redundancy with all the clones and plot lines, but actress Tatiana Maslany's performance for each of her roles is too impressive to not give the show a chance.

"Tatiana Maslany has amazed audiences and critics for two seasons in Orphan Black, playing Sarah, Cosima, Alison, Helena and many more clones from Project Leda. But in Season 3, the clone world is getting even more crowded, now that we know a male strain exists, Project Castor, played by Ari Millen," writes IGN.

'Orphan Black' premieres on April 18^th on BBC America.