Eric Johnston (Original Miniseries & The Final Battle)
Sean Donovan is a minor character in the original series, appearing in V: The Original Miniseries, V: The Final Battle and V: The Series.
Biography[]
Sean Donovan was the son of Mike Donovan; he lived apart with his mother, Marjorie. Before the Visitors arrival, he used to meet his father from time to time, something that his mother didn't like as she saw the relationship with Sean as sort of a competition between her and Mike, in which she believed herself always to be the losing side.
After the arrival of the aliens to Los Angeles, Sean, just like many other teenagers in the city, became very excited about the idea of meeting the Visitors. One of his friends managed to acquire a model of a Visitor's shuttle and action figures of the most famous aliens, including the one of Diana. The boy dreamed to have as much, so he asked his father to buy him something as cool as his friends had.
When Mike was accused of commiting serious crimes against the Visitors, Sean was one of a few people that didn't believe it.
Some time later, the Visitors began a full-scale invasion of the planet and took many humans as prisoners, whom they transported to the Mothership, where they would be stored for further conversion into food for the Visitors. Sean was one of the many held there; Mike tried to save him, but he failed.
It was his grandmother, Eleanor Dupres, who, being sympathetic to Visitors promises of helping people, asked the Visitors representative Steven to see into the matter and make her grandson return home. Sean was returned, but not before he was converted by the Visitors. Later, the Visitors would use him to spy on the Resistance.

Sean in the Visitor Youth Corp
Mike Donovan lost contact with his son for quite some time before he later found Sean as a member of the Visitors Youth recruit program. By that time, the boy had been brainwashed significantly and wouldn't listen to Visitors protesters.