Unless the bears start off encircling him. I think he stands a good chance in most environments.
1) OB a huge trench almost 360 degrees around him, leaving a thin sliver of a path for bears to approach and/or him to escape.
2) blast a section of the bears, maybe killing up to a 10,000ft depth at a time (if each bear is roughly 1' thick by 1.5' wide and they're packed together, then they would form a wall/circle 6M' deep by 9M' circumference. 10,000ft deep by 100ft wide = approx 10,000*66 bears = 660,000 bears per focussed OB.
3) thin re- OB the trench so that all the fallen are killed or set ablaze... creating a 'ring of fire' with the fallen bears.
I think Cyclops would eventually win.