Batman Spin-off - sort of ...
This concerns the Batman show (1966).
In 1978 (or 1979 - shaky memory), a two-part miniseries was aired: Legends of the Super-Heroes. It featured Batman (Adam West), Robin (Burt Ward), and a slew of other DC characters (Hawkman, Solomon Grundy, Black Canary [played by a buxom actress known only as Danuta] and others).
This is a genuine spin-off and should be included in the grid.