A kid and his/her imaginary friend are involved in a conspiracy.
 

Hi peeps, I'm trying to find the name to a movie from ages ago (probably 1980s). I'm really hazy on many of the details or plot but it was about a kid and his/her imaginary friend and they're caught up in some sort of conspiracy due to, I think, some top secret info/device they come into. I'd thought the imaginary friend was Tom Seleck but I've gone through his list of movies and can't find anything. Not much to go on I know. Hopefully one of you amazing people on here can help and if not then thanks anyway.

Re: A kid and his/her imaginary friend are involved in a conspiracy.
 

Cloak & Dagger
1984, Richard Franklin. Starring Henry Thomas, Dabney Coleman, and Michael Murphy with Christina Nigra, John McIntire, Jeanette Nolan, Tim Rossovich, William Forsythe, Robert DoQui, and Linden Chiles. The Macguffin is hidden inside an ATARI game cartridge.

https://www.youtube.com/watch?v=HUwucE-kh6I

Damn Pike. You're good. Thats looks like it. Thanks :-)