As much as we at TVLine aim to keep you apprised of fun and exciting casting news, the fact is that sometimes (though rarely!) TV shows enter super-stealth mode in the name of springing a surprise on all of us.
In fact, with Disney+ launching its slate of live-action Marvel series this year, 2021 packed a bigger “surprise casting!” punch than ever, using the small screen to introduce at least two new players to the MCU (while also making X-Men fans do a very fun double take).
With such casting coups and similarly delightful cameos in good supply this year, TVLine’s 2021 in Review has rounded up nearly 20 on-screen appearances that caught the audience at large off guard and/or teased us all with a fun wink-wink.
From Gordon Sumner’s involvement in a Murders plot to the Supergirl series finale’s crowd-pleasing encore, let’s revisit some of the year’s very best cameos and most secret castings — and then chime in with the ones you enjoyed most!