During season four, the Government captured Spike and implanted a Behavioural Modification Chip in his head in The Initiative. It rendered him incapable of attacking humans without intense neurological pain, though he could attack demons. Spike first realised he had it when he couldn’t bite Willow. He later made a …

In Dead Things, Warren, Andrew and Jonathan invented a ‘Cerebral Dampener’ so that they could control any woman they desired. Warren used it to make his ex-girlfriend Katrina his sex slave, but he killed her when it’s effect wore off and she tried to leave. The cerebral dampener was made …

The Initiative had a two-way communication device called a com cam. It is worn on the head and enables images, sound, location, and the wearer’s heart rate to be transmitted back to base. Buffy wore one in The I in Team when she was sent on a mission by Walsh, …

The trio of nerds invented a freeze ray gun in Smashed. They used it on Rusty, the security guard at Sunnydale museum, while they were stealing the Illuminata - a diamond which they used in their invisibility gun.

Hostile Sub-Terrestrials (or HSTs as Buffy accurately guesses in Doomed) was the Initiative code name for vampires and demons. In Doomed, Riley says that the Vahrall demon is “not a capture, it’s a kill,” meaning that the Initiative don’t capture all their specimens alive for experimenting.

The trio of nerds invented an invisibility ray, using the Illuminata diamond, stolen from Sunnydale museum in Smashed. They accidentally shot Buffy with it in Gone, and she became invisible. Anya and Xander discovered that the invisibility ray was actually unstable, and everything it was used on eventually disintegrated.

Warren, Andrew and Jonathan attempted to rob a security van in Seeing Red, but Buffy stopped them. Warren escaped using a jetpack. Andrew had a pack too and tried to fly away but was knocked out when he hit the roof of a building. The two had planned to fly …

A tracer is an electronic tagging device used by The Initiative. One was used on Spike in The I in Team, but was removed by the Scoobies and flushed down the toilet.