In season 4 of Batman '66, we begin building to Burt Ward leaving as Robin. Burt Ward wouldn't leave until the end of a movie set after season 4. But still, season 4 would be used to build to Robin and Batgirl possibly being written out to have a spin-off of some sort. Meanwhile though, old foes and new foes alike show up to bedevil Batman. The Riddler, Both Catwomen, The Bookworm, The Scarecrow, Poison Ivy and many more show up to bedevil Batman. Plus, the debut of Jason Bard! And an episode or two featuring the old Batwoman, Kathy Kane!
