Team Knight Rider to Twin Peaks

1. Dr. Jackson Roykirk invented both the earthquake machine that had to be defeated by Team Knight Rider and the Nomad robot that had to be defeated by the Star Trek crew.

A Klingon Bird of Prey was seen in a spaceship graveyard on Red Dwarf

In the Red Dwarf episode "Psirens", the crew of the Red Dwarf come across a space ship graveyard which includes a Weyland-Utani ship, connecting it with Angel.

Angel was a spin-off of Buffy the Vampire Slayer.

The X-Files? Cigarette Smoking Man and Buffy the Vampire Slayer's Spike both smoked Morley cigarettes.

Fringe makes reference to The X-Files classification of files.

Fringe's Walter is friends with Dr. Jacoby from Twin Peaks