Friends had a number of guest stars, including George Clooney and Noah Wyle from E.R., but that episode was in no way a crossover. Here's why.
Hit medical drama ER served up some of the most memorable romantic storylines of recent history, though they weren't all great.
We're sure you'd be more inclined to head in for your yearly physical if these folks were your physicians.
The sad truth is that these days... no-one from your favorite TV show is safe. These are some of the most shocking TV deaths.
Entertainment is a costly business. Let's hope your favorite series has deep pockets as you read our list most expensive TV series ever made.