Stephen Fry guest stars as a spy that thinks Grampa is part of a spy ring.
Yeardley Smith guest stars as herself, co-host of the true-crime podcast Small Town Dicks.
It’ll be a musical episode, with music written by Bret McKenzie.
Benedict Cumberbatch guest stars as an aging Morrissey-type character.
Other upcoming episodes
The 700th episode will air on March 2021.
J. J. Abrams will guest star as himself.
The episode will probably air during the 32nd broadcast season (2020/21 TV season).
If you want to know more about Season 32, visit our page for it in our Wiki!
Stay tuned for more!