Recently the Arrowverse shows did Crisis on Infinite Earths. They invited every still living DC actor back to do a cameo with their world being one of the infinite earths threatened.
The following otherwise eligible fandoms had appearances in it: Batman (1966) Superman (1978 – Returns) Batman (Burton/Schumacher) Flash (1990 Birds of Prey (2002)
Of them Batman (1966), Batman (Burton/Schumacher), and Birds of Prey (2002) only had brief cameos showing the worlds being destroyed.
Arrowverse
The following otherwise eligible fandoms had appearances in it:
Batman (1966)
Superman (1978 – Returns)
Batman (Burton/Schumacher)
Flash (1990
Birds of Prey (2002)
Of them Batman (1966), Batman (Burton/Schumacher), and Birds of Prey (2002) only had brief cameos showing the worlds being destroyed.
Batman (1966) & Batman (Burton/Schumacher) - https://youtu.be/k54vZrbGb0Q
Birds of Prey - https://youtu.be/QLDzCqw6d8Y
The involvement of the Superman movies and 90s Flash are more substantial and plot relevant.