In the final episode, Angel and his team took part in one last stand against the secret society called the Circle of the Black Thorn. Everything seemed to be going according to plan, as Angel’s crew took out targets one by one, but Wolfram & Hart’s Senior Partners refused to go down without a fight, sending an army of demons down to raise hell on Earth… literally.

Seconds before the credits rolled, Angel, Gunn, Spike and Illyria not only prepared to face evil incarnate, but an unknown and terrifying future as well.

https://tvline.com/lists/cancelled-tv-shows-cliffhangers-series-finales-endings-hannibal-agent-carter/angel-cancelled-ending/