A wise, elderly version who holds the final secret to defeating Mandark.

Together, the four Dexters engage in an epic "four-on-four" battle against various versions of Mandark. Dexter's Laboratory: Ego Trip (TV Movie 1999) - IMDb [S5E7] Ego Trip

A buff, rugged version of Dexter who lives in a desolate future where Mandark has taken over the world. A wise, elderly version who holds the final

The plot kicks off when robots from the future invade Dexter's lab to destroy "the one who saved the future". Intrigued by his own eventual greatness, Dexter uses a time machine to travel forward and meet his future selves: [S5E7] Ego Trip