Dick Tracy under writer Mike Curtis has featured gust spots by a variety of other comics characters. Green Hornet just started a guest spot earlier this month:
http://www.gocomics.com/dicktracy/2018/04/09
Hornet in Dick Tracy
Moderators: Scott Sebring, Ben Bentley
Hornet in Dick Tracy
"I'm half-demented with whimsical outrage!"
-- The Joker, in a line cut from "The Joker's Epitaph"
-- The Joker, in a line cut from "The Joker's Epitaph"