First it was announced that David Tennant and Catherine Tate are re-teaming for a Lauren the Schoolgirl sketch. And now the two are taking part in a Doctor Who Twitter chat!? What a week...

Even the organizer of the DW rewatch seems taken aback, saying in her Twitter announcement, "This is not a drill."

https://twitter.com/Emily_Rosina/status/1251103329150779392?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1251103329150779392&ref_url=https%3A%2F%2Fwww.radiotimes.com%2Fnews%2Ftv%2F2020-04-17%2Fdavid-tennant-to-join-fans-for-next-doctor-who-watchalong%2F

Tennant took on the role of the Tenth Doctor from 2005-2010. And, he made a return appearance for the 2013 50th anniversary special "The Day of the Doctor." Tate played his companion, Donna Noble, from 2006-2010.

The rewatch will consist of two episodes, "The Stolen Earth" and "Journey's End," both from season four. If you need a refresh, here are the trailers for each episode:

https://www.youtube.com/watch?v=demOp3pAaAQ

https://www.youtube.com/watch?v=GZxo0DYXRdA

You can also look for former showrunner Russell T Davies during the Twitter meet-up. And Graeme Harper, who directed DW from 2006-2009.

You have a little bit of notice to catch up on the episodes, with the chat happening this coming Sunday on Twitter at 2pm EST in the U.S. (7pm in the U.K.). Or, you can just watch the episodes in real-time on Sunday and post your reactions/questions as you go.

Tennant isn't very active on social media, making this even more of a moment. But, his wife Georgia is, becoming a bit of an Instagram influencer with her fun updates. Like this one:

https://www.instagram.com/p/B-4gTsBpY1r/

Are you going to take part in the watchalong? Let us know how it goes!