The fourth season finale for "Arrow" is titled "Schism," but whether that refers to a metaphorical gap forming between members of Team Arrow, or a literal rupturing of the ground beneath Star City remains to be seen. Oliver does look a little frustrated with Diggle in one photo, though.
The finale's synopsis also teases a "surprising force" helping Oliver out in his battle with Darkh, though who -- or what -- that is remains a mystery.
OLIVER TEAMS UP WITH A SURPRISING FORCE TO STOP DAMIEN DARHK -- Oliver (Stephen Amell) teams up with a surprising force in an attempt to stop Damien Darhk (guest star Neal McDonough) and his magic once and for all.
"Arrow's" Season 4 finale airs Wednesday, May 25 on The CW at 8 p.m.