Wednesday night's all-new 'Arrow' installment, "The Scientist," kicked off the first of a two-part finale to bring the second season to its midway point and Barry Allen (Grant Gustin) into Oliver Queen's vigilante world. The arc will conclude with next week's "Three Ghosts," and the extended midseason trailer for the finale has hit with a heaping helping of spoilers!

While Oliver Queen (Stephen Amell) looks to be drifting in and out of consciousness following his mystery injection at the climax of "The Scientist," it seems hallucinations bring both Shado and Slade ('Spartacus' star Manu Bennett) to present-day Starling City. Or do they? We see what appears to be Oliver fighting Slade in his lair, which would have to be one powerful hallucination, no?

In addition to our first look at Oliver's new domino mask, here's what The CW says "Three Ghosts" will bring:

OLIVER IS VISITED BY GHOSTS FROM THE PAST — After a fight with Cyrus Gold AKA the Acolyte (guest star Graham Shiels), Oliver (Stephen Amell) is drugged and left for dead. Determined to cure him, Felicity (Emily Bett Rickards) makes a risky decision. The cure causes Oliver to hallucinate, and what he sees forces him to confront his past. Meanwhile, Barry (guest star Grant Gustin) continues to help Felicity, and their connection grows stronger. The Arrow asks Lance (Paul Blackthorne) to look into Gold, but when the stakeout on Gold goes bad, someone is killed. Roy (Colton Haynes) is captured and tortured by Brother Blood (guest star Kevin Alejandro).

What do you think? Could 'Arrow''s shocking midseason finale deliver a few surprise twists as Oliver takes on the Acolyte (*cough*, Solomon Grundy) once more? What other flashy transformations might we expect over the hour? Check out the trailer for "Three Ghosts" above, and give us your 'Arrow' season 2 predictions in the comments!