There was never any episodes in which O'Neill has become invisible. In the episode "200" of the tenth season (about the "wormhole Xtreme" movie), there were two "fake" flashbacks. The first is when SG1 visited a planet inhabited by the Furlings. (which resembled the ewoks in Star Wars). The second one is where O'neill turned invisible.
Colonel O'Neill turned invisible in the Stargate SG-1 episode titled "Memento." This occurred when he was exposed to the invisibility device created by the alien scientist Ma'chello.
in "The torment of Tantalus," they discovered pentagon tapes of the stargate being turned on but the mission failing. S01E11
it drinks invisible milk that's how it turned invisible
A warship was turned invisible
Episode 27 or Operation F.U.T.U.R.E
The episode is: 'Bad Girl McGuire'.
Bobby farted on him and turned invisible
it was when he turned water into wine at the wedding in Cana
She does'nt.
Season 1, Episode 61 "The Misty Mermaid".
sonic universe episode 160 this episode is how scourge turned green
It was in 'The Dark'
Super Saiyan 3?!