What are some of Batman’s most epic team ups?

What are some of Batman’s most epic team ups? Please let me know let’s discuss the Dark Knight working with other hero’s that are not a Robin. I really like it when the Flash and Batman team up . I really like the Button and the Price as epic stories of the best DC Detectives.

Swamp Thing Vol 1 #7
December, 1973
NIGHT OF THE BAT

Batman battles Swamp Thing in Swamp Thing #53 “The Garden of Earthly Delights”

1973, Detective Comics 437 to 443, Manhunter by Archie Goodwin and Walt Simonson Team up in Last Issue