Oliver Queen (Stephen Amell) has faced many enemies over the last eight seasons of Arrow: China White, Count Vertigo, Malcolm Merlyn, Richard Dragon, to name a few. He has defeated Egyptian sorcerers, cosmic aliens and even interdimensional aliens. But never, never has he faced a villain so horrible, so dastardly, so diabolical as a... hammock?In a new video from the set of the "Crisis on Infinite Earths" crossover, Amell can be seen struggling to maneuver his way out of a hammock. "Crossovers are hard," he wrote in the tweet.RELATED: Black Lightning: Cress Williams Explains How He Leaked Crisis Announcement

Hopefully Oliver will be able to get out of the hammock soon, as his most difficult foe is fast approaching. The Anti-Monitor already destroyed an entire universe right in front of him, and there will most definite be more destruction before all is said and done. It is possible that Oliver will confront this interuniversal threat before the "Crisis" even arrives.

"Crisis on Infinite Earths" begins Sunday, Dec. 8 at 8 p.m. ET/PT on Supergirl, then continues in Batwoman on Monday, Dec. 9 at 8 p.m. ET/PT and in The Flash on Tuesday, Dec. 10 at 8 p.m. ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, Jan. 14 in Arrow at 8 p.m. ET/PT and in DC's Legends of Tomorrow at 9 p.m. ET/PT.

KEEP READING: Iris West and Lois Lane Team Up in New Crisis on Infinite Earths Photo