Isn't it always so much fun when an old costar pops up on an actor's new TV show?
In honor of Bradley Whitford's guest appearance on Mom Season 4 Episode 9, we thought we would compile a list of some of our favorite TV reunions.
We're not talking about spinoffs or remakes, but just those awesome times when an old friend stopped by for a visit, creating a fun sense of nostalgia.
Check out our list and be sure to let us know your favorites!
1. A Parenthood Reunion on Gilmore Girls
After Parenthood ended, Lauren Graham couldn't help but bring her castmates with her to the revival of her first successful show, Gilmore Girls. Her TV daughters interacted when Lorelai and Rory ran into Mae Whitman's character on the streets of New York. In another episode, her old Parenthood flame, Jason Ritter, and TV brother/real life flame, Peter Krause, made appearances as no-nonsense park rangers Lorelai encountered as she tried to find herself by hiking the Pacific Crest Trail.
2. David Schwimmer Stops By Episodes
This actually wasn't the first Friends reunion on Episodes as James Michael Tyler (Gunther) made an appearance too, but this one was definitely more memorable. The two Friends bumped into each other at a foreign dictator's party and hilariously discussed just how far the former stars were willing to go to make money. It turned out Matt sold himself short though as David was paid double!
3. Browncoats Reunite on Castle
Nathan Fillion had several of his old Firefly buddies drop by the set of Castle. Adam Baldwin, Gina Torres, Jewel Staite, and Summer Glau all reunited with their former browncoat wearing space captain. Baldwin actually guest-starred twice as detective Ethan Slaughter. No one could ever replace Beckett as Castle's partner, but if someone had to fill in for a couple of episodes, Baldwin was a great choice.
4. Seth Green Visits How I Met Your Mother
Who wasn't excited about the prospect of Willow and Oz together again on How I Met Your Mother? Seth Green was hilarious as an old friend of Lily and Marshall's that falsely believed the three of them were still best friends. Daryl was pretty creepy, but we still loved every minute of this Buffy reunion.
5. Friends Again on Cougar Town
It was fun when Lisa Kudrow and Jennifer Aniston appeared on Cougar Town, but the best reunion was when Matthew Perry visited, reuniting one of TV's all time best couples. We even sort of got to see them as a couple again, as Jules was pretending to be interested in him to get out of paying for the damage she did to his car. The flash mob proposal was awesome, but the best part? Definitely Matthew Perry calling her "Monica" instead of Jules in one scene.
6. Roseanne Comes to The Big Bang Theory
Sara Gilbert's stint on The Big Bang Theory reunited Darlene with David, especially considering Leslie and Leonard dated for awhile. Leslie was such a funny character, making her rounds of the group (moving on to Howard after Leonard) and terrorizing Sheldon every chance she got. She even returned for the series' 200th episode. Of course, Laurie Metcalf also recurs as Sheldon's mother, and the series staged another big reunion when they cast Katey Sagal to play Penny's mom.