In Season 3, Episode 16 ( Urgo ) all members of the SG1 Team (O'Neill, Carter, Jackson, Teal'c) get against their will alien technology planted in their heads, which purpose is exploring other worlds. This technology makes them see the image of Urgo who wants to have fun with them and to learn from them. In reality Urgo is an image of the alien Togar, who invented him, and has all the abilities that his maker does not have (like wanting to have fun, not being afraid of exploring etc.).