The Sideways actor briefly appears in season, portraying Bojack Horseman on another fictional true-story programme, American Dead Girl: The Sarah Lynn Story.
The Bojack version of Garfield also loves lasagne but hates Mondays – the same character traits as the cynical animated cat Garfield.
The Westworld actor voices the showrunner of failed The BoJack Horseman Show, offering some sage advice for our eponymous character (”Sometimes you need to take responsibility for your happiness” is just one of his great lines).
No other celebrity cameo has become as synonymous with BoJack as Esteemed Character Actress Margo Martindale.