We are at the midseason finale of [The Flash](series:1068303) and some new characters are coming our way a soon as it continues on the 20th January (or something like that) with Mark Hamill to return as Trickster and Nicholas Gonzalez to play Sisco's brother also Heatwave to finally show himself and Nightshade would probably make an appearance, lets put that away and focus on the topic here I personally think Cyborg could appear in The Flash for a few reasons and that involves his father and Barry.
Silas Stone and Barry Allen Know Each Other
If you've watched Justice League War movie then you must know that Barry Allen AKA The Flash knows Silas Stone. Much like Harrison Wells, Silas Stone is also a scientist and he knows Barry is The Flash.
But where does that put Vic' Stone (Cyborg)? Well what if there was to be an origin story of Vic' Stone like a flashback that shows him how he became Cyborg.
Vic' Stone and The Flash Might Probably Have Known Each Other
Come on who doesn't know Vic' Stone the star player of football (can't remember the team name) so maybe The Flash could ask Cyborg for help in the future (I didn't mean "THE FUTURE" I mean future episodes).
Plus if he would appear in it he'd most probably look like this...
It would be great to see Cyborg appear on The Flash