To the delight of Star Wars fans the world over, Luke Skywalker made a cameo appearance in the season 2 finale of The Mandalorian, cutting down a legion of Darktroopers in order to save Din Djarin and take Grogu under his wing.
Jon Favreau, Dave Filoni and co. went to great lengths to keep the legendary Jedi's involvement under wraps, and that level of secrecy evidently extended to the show's cast.
While taking part in a charity live-scream with Star Wars Explained, Bo Katan-Kryze actress Katee Sackhoff revealed that she and the rest of the cast were told that Plo Koon was the Jedi that'd be showing up to get them out of a fix in the last episode.
Skip to around the 13.25 mark in the player below.
Plo Koon was killed along with most of the Jedi Council members after Order 66 was initiated in Revenge of the Sith, but he played a key role in The Clone Wars animated series, and if Lucasfilm did decide to bring him back someday, we can't imagine there'd be too many complaints.
Sackhoff was also asked if she's on board for The Mandalorian season 3, but wasn't able to confirm Bo Katan's return (she'll totally be back).