Everything I describe exists. Brain Computer Interfaces have long been established and you can even build them yourself from DIY kits that are sold online. They can be operated wirelessly. Human brains can and have been linked non-invasively, so without surgery, over a distance of thousands of kilometres. Synthetic telepathy or mindreading is a byproduct of BCI's and is openly acknowledged to exist. Dreams can be recorded and played back to watch. Biological information can be digitized and sent over the internet and upon arrival reformed into biological matter. People's bodies can be controlled wirelessly by others who have the link.

Below some examples:

BCI's exist

A Brain Computer Interface creates a link between a brain and a computer, whereby signals can be sent from the computer to the brain and vice versa. This makes it possible to control an external robot arm with your thoughts using a BCI. The opposite is also possible: the computer can send information to the neurons in the brain, forcing things to happen in or to the body. BCI's have been around for a long time, a neurophycist called dr. Delgado was able to influence the behavior of human subjects by implanted electrodes and radiowaves in 1968, and two way communication between a brain and a computer was possible in 1970. 

BCIs come in two forms, invasive, so in the head itself, and non-invasive, using an external wearable cap, glasses or other device on the head. Invasive used to mean via an implant, but now that there are nanobots as small as a grain of salt, that is no longer necessary. They are called neurograins and can both read information and write it to the brain, and this happens live and in real time, at the same time that something is happening. This allows you to influence all processes in a body. A non-invasive BCI now simply exists in the form of glasses with an EEG sensor that picks up the signals from your brain, allowing you to communicate with a computer by simply thinking about something. The technology is so advanced that not only is it possible to control an external robotarm with your thoughts but also to feel things with prosthetic limbs.

BCI's can be bought online for as little as 999 dollars and you can even build them yourself, for "basic level synthetic telepathy". BCI2000 is open source software to create BCI's with which was released in 2001.

BCI's come in wired and wireless forms, the latter in the form of implants or electrodes. The implants themselves are getting smaller and smaller, but electrodes in the form of nanobots, neural dust or neurograins are now so small that they can be injected and even spread through the air. They can write information to and from the brain at the level of a single neuron. In my experience, this can take over control of your body in every conceivable way, from moving your limbs, pinching nerves, regulating your breathing, heart rate and bowel movements to reading your thoughts and much more. This reading and writing to the brain is done by means of magnetic nanoparticles and ultrasound. The following things can be done just by thinking about them, and were possible as early as 2009: type letters on a computer screen and tweet them, play a computer game, move an external robot arm, drive a toy car, control nanobots inserted into a cockroach, send answers directly to a tablet using only EEG glasses/BCI, Google with your brain, and connect your brain to ChatGPT and ask it questions directly.

Non invasive BCI's work by means of an EEG. This can be done remotely and even without the subject's knowledge of it since 1969, see the released CIA memo describing this and the first patent for the remote access and alteration of someone's brainwaves from 1976. I believe NASA's EFI system is used as well for what is called Remote Neural Monitoring. As we all have a unique brainwave pattern that no one else has, this is called EEG based biometry, once you're mapped in the system. 

You can buy them online and make them yourself for basic level synthetic telepathy.

Mindreading aka synthetic telepathy exists

Reading and decoding someone's EEG makes it possible to read their mind. This process is called synthetic telepathy and its start was in 1928. The technique is being built into everyday portable devices as headphones and earbuds these days. 

Brains can be wirelessly linked to form a network

The wireless linking of two and more human brains has been possible since at least 2014. It can be done over a distance of thousands of kilometres without any surgery necessary. Monkeys have been shown to learn to cooperate, making a bigger network of their collective brains, to perform tasks together. Humans can be seen in one of the above videos controlling the movements of an inflatable shark, where one uses the command for "left", someone else the one for "up" and so on. In that video there is a wired connection between them but the existence of nanobots capable of transmitting information wirelessly makes that obsolete. When asked if linking 100 people's minds would be possible the answer was: "Yes that's the whole point."

Dreams can be recorded and played back to watch

Dreams can be recorded and played back to watch on a screen. This has been possible since 1999, see the first dream with the person's REM activity shown on the left during the dreamrecording. The technique obviously has come a long way since then, it uses an algorithm and AI now to decode and reform dreams. And as someone commented: if it is possible to take dreams from someone, wouldn't it then also be possible in the other direction, meaning: can you give someone dreams? In my experience: yes, this is possible.

Biological information can be digitized and sent over the internet

Someone's physical body can be taken over

Dust-sized sensors can be implanted in the body and by means of ultrasound used for both in body telemetry, the reading out of data concerning your organs, and to stimulate nerves and muscles. 

The former CIA physician, dr. Morgan, says: "If we can design a cell to go into your body we can take it over" (parafrased). From here.